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Mathematics Questions and Answers May 29, 2023

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Which of the following or is accompanying 95% confidence interval would not be significantly different than the infant group 1.0? A. 1.42; 95% CL 1.12, 2.30 B. 1.85; 95% CL 1.72, 2.09 C. 1.99;95% CL 1.6 2.14, D. 2.79; 95% CL 0.92, 3.01

Female height is normally distributed. The average height for adult women in the United States is 63.7 inches (a little under 5 feet 4 inches) and the standard deviation is 3.5 inches. a) Calculate the z score of a female who is 69.1 inches tall (5 feet 9.1 inches)? (Round your answer to 2 decimals.) b) What proportion of female adults in the

Let denote the probability that, starting in state i, the Markovian process will ever reenter state i. Suppose that state i is transient, i.e., < 1. Prove that the process stochastically will reenter state i just a finite number of times, with the average of 1/(1 )

A card is drawn from a standard deck of 52 cards. What is the probability of getting a heart or a red face card? Give your answer as a decimal rounded to 3 places.

Find the probability that A wins. That is, find . Give your answer correct to two decimal places. Hint: use the law of total probability with E1= "A wins in round 1", E2= "B or C wins in round 1", E3= "nobody wins in round 1

Using the digits from the set [0, 1, 2, 3, 4, 5, 6], find the amount of odd three-digit numbers that can be created.

Why should the following survey question for the customer of a bank be rewritten? "How satisfied were you with our customer service and the interest rate we offer? (very satisfied, somewhat satisfied, somewhat unsatisfied, very unsatisfied)" Multiple choice question. The choices are ambiguous. The respondent is not likely to have an opinion about

You are testing the claim that the mean GPA of night students is different from the mean GPA of day students. You sample 30 night students, and the sample mean GPA is 2.35 with a standard deviation of 0.46. You sample 25 day students, and the sample mean GPA is 2.58 with a standard deviation of 0.47. Test the claim using a 5% level of

Make a scatterplot of these data based on the scatterplot do you expect the correlation to be postive or negative?Select the statements that would allow you to conclude that the relationship between a response variable and an explanatory variable is linear

Load the dataset on Canvas ("Files Homework Homework 3 Data") using pandas 2) Use Preprocessing on the data 3) Perform regression on this dataset (a) Use linear regression (b) Solve it with gradient descent (c) Solve it with closed form solution (d) Solve it again with just sklearn library (e) Print out the final total error (f) Print out the

A drawer contains n white and n black socks. Each white sock has a unique design, and each black sock has a unique design. Two socks are selected at random from the drawer. Every way of selecting the two socks is equally likely, and the order in which the socks are selected does not matter. How many ways are there to select the two socks? Question

Use the Internet to Find the heights of Toronto raptors players. Enter players' names and corresponding peaks into columns A and B respectively. Make a histogram (Graph) to display the data on Excel Sheet.

Choosingwhich Computer Software to Use In this activity, you will download a spreadsheet and open it in Excel (most of you should have it installed on your computer already) or Google Sheets (free in any browser) or any other program that you'd like to use that can do these things (you might have Minitab, for example, and know that it can do the

Holly is predicted to have a VO2max of 45 ml/kg/min on the graded exercise test using a linear regression equation based on mile time. According to the regression model, mile time (X) explains 86.8% (r2 = .868) of the variance in VO2max (Y) from a sample of measured VO2max that had a standard deviation of 5 ml/kg/min. How likely is it that her

When are nonparametric statistical procedures used?

The Big River Casino is advertising a new digital lottery-style game called Instant Lotto. The player can win the following monetary prizes with the associated probabilities: 5% probability to win $10 4% probability to win $15 3% probability to win $30 1% probability to win $50 0.1% probability to win the Grand Prize, $1000. (a) Calculate the

Assuming that the data are normally distributed What z-scores separate the middle 55% of the data from the rest of the data?

If the number of products manufactured in a factory in a day are 3,500, and the probability that some pieces are defective is 0.55, then the mean of binomial probability distribution is 1,925 1,575 3,500 There is not enough information

The application used for that is financial analysis including the quantmod package for R. quantmod stands for Quantitative Financial Modelling Framework. Conduct a Financial analysis of the stocks of Apple and Samsung to compare their trends. You should include all plots and/or figures you generate for your financial analysis

The following are weights in pounds of a college sports team: 165, 171, 174, 180, 182, 188, 189, 192, 198, 202, 202, 225, 228, 235, 240 Find the weight that is 2 standard deviations below the mean. (Round your answer to the nearest pound) __________ Find the median. ____________ Find the third quartile. __________________

If the value of x is less than for a standard normal probability distribution, then the z-statistic is positive the z-statistic is negative the z-statistic is equal to zero f(x) will be an even number

In a certain country, the true probability of a baby being a boy is 0.527. Among the next eight randomly selected births in the country, what is the probability that at least one of them is a girl? The probabilty is [ ]. (Round to three decimal places as needed.)
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DCOI Question 4
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Determine the number of distinguishable arrangements of the letters in the word MISSISSIPPI

Is there a correlation between race influencing whether or not a person continues to shop at a store following a protest? What is the best statistical analysis to be used with this question if two numerical variables and explanatory and response are being assessed?

A realtor wishes to know what proportion of household occupants in the region own their home (as opposed to rent) within 0.07 at the 20% level of significance. How big a sample must be collected, if the true proportion is known to be at least 0.57? ( SHOW WORK )

Please Identify the consequences (i.e., increase, decrease, or none) that the following procedures are likely to have on both bias and sampling error in an experimental study. a. Assigning treatment to subjects alphabetically, not randomly b. Increasing sample size c. Calculating power d. Applying every treatment to every experimental unit in

The least squares regression line for predicting SAT scores from GPA scores is found to be Predicted SAT = 137.01(GPA) 239.42 and r = 0.83. The scatter diagram is football shaped. Predict the SAT score for a student who's GPA is 3.5

What of the following statements is/are about the F test for the simple linear regression model? Please select all that apply. It's possible that there is only one correct answer. Group of answer choices The observed F statistic can be negative Under the null hypothesis, the test statistic has an F distribution. The second degree of freedom for

3. (30%) A congested computer network has a 1% chance of losing a data packet and packet losses are independent events. An e-mail message requires 100 packets. a. (4%) What is the distribution of data packets that must be resent? Include the parameter values. b. (5%) What is the probability that at least one packet must be resent? c. (5%) What is
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can you show it step Chapter 9, Section 2, Exercise 032 Use the following ANOVA table for regression to answer the questions. Response: Y Source DF Sum Sq Mean Sq F-value Pr(>F) Regression 1 347.60 347.60 12.72 0.000 Residual Error 359 9811.47 27.33 Total 360 10159.07 Give the F-statistic and p-value. Enter the exact answers. The F-statistic is
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If a survey question addresses more than one idea, Multiple select question. the results cannot be properly analyzed. the respondent is likely to become confused. the survey will deliver twice as much valuable data. people will perceive that the survey is short, and they will be more likely to complete it

Create a scatter plot that displays the association between poverty levels and death from cancer. Label each axis of your scatterplot and give it an appropriate title

Calculate the Chi Square Test for this data Calculate Degrees of freedom Calculate p-value Calculate conclusion- difference. Significant difference? Data Table 12: Millet Seed Data Round Seeds Wrinkled Seeds Total Expected number of individuals 86 86 172 Observed number of individuals 123 49 172

I need help solving the rest of this problem, both questions 3A and 3B. I have solved most of it but need help with the rest. Also, if anything i filled out is wrong please correct it.

The heights of pecan trees are normally distributed with a mean of 10 feet and a standard deviation of 2 feet. (a) What is the probability that a randomly selected pecan tree is between 9 and 12 feet tall? (b) Find the 75th percentile of the pecan tree height distribution. (a) For a sample of 64 pecan trees, state the standard deviation of the

Last year, 46% of business owners gave a holiday gift to their employees. A survey of business owners indicated that 40% plan to provide a holiday gift to their employees. Suppose the survey results are based on a sample of 60 business owners. (b) Suppose the business owners in the sample do a they plan. Compute the p value for a hypothesis test

H0: 16.95 vs. HA: > 16.95 What is the test statistic forsample of size 21, mean 13.57, and standard deviation 1.73? Enter the test statistic with 2 decimal places.

Problem 6 [10 points = 3 + 7] Quality Control specialists design a study aimed at estimating the average assembly time for a new device. They assume that individual records are independent normally distributed with population standard deviation = = 2.5 minutes. Find the smallest sample size = n, such that the 95% confidence interval for the

A and B play a game. The probability of winning the game is p. Players A and B take turns attempting to win the game until somebody wins, starting with player A. If A fails, then it is B's turn to attempt to win. What is the probability of B winning the game?

Determine the z-values corresponding to the top percent of data and the middle percent of data. Show Solutions Assuming that the data are normally distributed, Standard Normal Distribution Table a. What z-scores separate the middle 55% of the data from the rest of the data? Aanswer: ? b. What z-scores separate the middle 10% of the data from the

At a party, 10 students put their name badges into a box and mix them up. 10 students randomly select name badges from the box simultaneously and each student selects one badge only. We say a match occurs if one student selects his own name badge. (a) What is the probability that there is no match for these 10 students? Show the detail steps of

The total score for "Cost of Debt" is 10 points. There are 56 cells you must fill up with the correct value. And each cell with the correct answer earns proportionate points. We already studied and learned how to compute the weighted average cost of debt from Module 4 (

Suppose you are testing if the mean GPA of CdM seniors has increased from last semester. If you calculated the test statistic ("z") to be 1.66 and you are testing at the 5% significance level, what is the correct p-value and decision

Which testing or grading practice is appropriate for teachers to use? using pretest scores in determining grades informing students of what to expect on tests assigning a zero for missing work Give useful and specific feedback to improve performance

15. Five friends go to their favourite restaurant which has 8 different lunches on the menu. If the friends are equally likely to pick any of the dinners, what is the probability that two or more of the friends will order the same lunch? {4 marks)
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Consider a horse race with 5 horses. The race running time of horse ???? [expressed in minutes] is a random variable described by ???????? = 2 + ????????, where ???????? follows an exponential distribution with mean value ???????? = 1/i for i =1,...,5. The horse with the shortest running time wins the race; the race time is the running time of the

The reduced cost for a decision variable that appears in a Sensitivity Report indicates the change in the optimal objective function value that results from changing the right-hand side of the nonnegativity constraint from

This Question: 1 pt 2 of 16 (0 complete) This Test: 16 pts possible The weights of a certain brand of candies are normally distributed with a mean weight of 0.8563 g and a standard deviation of 0.0512 g. A sample of these candies came from a package containing 450 candies, and the package label stated that the net weight is 384.5 g. (If every

An analyst wishes to create two macro variables containing the average weight of females for non-smokers and smokers respectively. The data set dis.dislipid contains a column male (0=female, 1=male), a column currsmok (0=not a current smoker, 1=current smoker) and a column weight that gives each participants weight in pounds. show sas code that

Data on amounts of coffee consumed (in oz) were collected from 513 undergraduate students in a private university in the Mid-Atlantic Region as part of a study of undergraduate students' nutrition. The mean amount of coffee consumed is 35 oz (sd = 6), with a 95% confidence interval of (34.5, 35.5). What is the margin of error for the mean amount

For all of the California Community Colleges, the population of full-time faculty members have a mean age of 46.2 years with a standard deviation of 7.4 years. Assume that the ages of full-time faculty members is normally distributed. If a randomly selected full-time faculty member is selected from a California Community College, what is the

Approximately 10% of all people are left-handed.Consider a grouping of fifteen people. a.)State the random variable.Random variable: x= number of left handed people b.)Write the probability distribution. c.)Draw a histogram. d.)Describe the shape of the histogram. e.)Find the mean. f.)Find the variance. g.)Find the standard deviation.

The handedness of a group of 3 people are Ambidextrous (A), Lefthanded (L), or Righthanded (R). Suppose two people are randomly selected with replacement (that is, a person is selected, their handedness is observed and they are returned to the group of three people). Let A be the event of selecting an ambidextrous person, L be the event of

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The average weight of men in the United States, aged 20 years or older, is 195.7 pounds and the standard deviation is 29.5 pounds. a) Calculate the z score for a man in the United States who weighs 245 pounds. (Round your answer to 2 decimals.) b) Calculate the z score for a man in the United States who weighs 182 pounds. (Round your answer to 2

can you show it step Chapter 9, Section 2, Exercise 031 Use the following ANOVA table for regression to answer the questions. Analysis of Variance Source DF SS MS F P Regression 1 3400.7 3400.7 18.9 0.000 Residual Error 174 31302.6 179.9 Total 175 34703.3 Give the F-statistic and p-value. Enter the exact answers. The F-statistic is The p-value is
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Given the following multiple regression equation: Expected Travel Cost= 90+48.5*(number of days on the road)+0.4*(distance traveled in miles). The coefficient of correlation is 0.68 Your direct report requested $780 for reimbursement on the recent business trip. How do you approach this issue? Do you think there is an ethical violation here?

Motorola used the normal distribution to determine the probability of defects and the number of defects expected in a production process. Assume a production process produces items with a mean weight of 10 ounces. a. The process standard deviation is 0.10, and the process control is set at plus or minus 1 standard deviation. Units with weights

A company sells pumpkin seeds. They advertise that they will offer you 100 pounds of free topsoil if it takes their pumpkins more than a certain number of days to grow to maturity. They wish to only have to give away free topsoil AT MOST 3% of the time, and the number of days it takes their seeds to grow to maturity follows a normal distribution

Suppose you find a correlation coefficient of -0.21. Pick the correct words below to describe the relationship. Strong Weak Positive Negative

gent | x C two cards are x C | Chegg.com x \\ History of An X A brief history X MLA Annotat X Course Home X P Midterm Exam X n.com Student/PlayerTest.aspx?testld =246401931¢erwin=yes 0* *Update Makyla Smith 10/25/22 4:51 PM Question 12 of 30 This test: 30 point(s) possible Submit test This question: 1 point(s) possible The numbers of courses
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2. Find the z-score and show your work for each of the following scenarios: a. Mean = 20, s = 4, x = 20 b. Mean = 20, s = 4, x = 21.50 c. Mean = 18, s = 3, x = 20 d. Mean = 567, s = 11, x = 556 e. Mean = 33.82, s = 1.09, x = 34.45 f. Mean = 5.60, s = 0.14, x = 5.53 3. Sketch, shade, and solve for the area below each of the z-scores you found in

Find the first quartile for this list of numbers 53 46 30 82 100 84 94 48 25 1 93 68 97 54 16 Quartile 1 =
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Find the mean for this list of numbers 5 47 37 54 35 4 92 97 76 16 88 46 19 98 78 Mean =
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An important application of regression in manufacturing is the estimation of cost of production. Based on the data below relating cost (Y) to volume (X), what is the cost per widget? Production Volume (units) Total Cost ($) 400 5424 450 5657 550 5759 600 7294 700 7583 750 8603 425 5311 475 6093 575 6662 625 7380 725 7784 775 8588 Which is correct?

When evaluating level, what are you looking for? a) celebration value in time to master program b) low variability across the trend line c) accuracy of performance d) frequency level compared to the aim

For Unit 8, Lessons 15 and 16 will be combined. For your final paper, in approximately 1,000 words, please list the events covered in this course that you enjoyed studying the most. Also, you can give an overall recap of the previous 7 units

Find the mode for this list of numbers 4 46 88 47 66 51 75 77 22 4 23 86 64 16 90 Mode =
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Based on the ideas presented in this ZAPS lab, which of the following tasks would you expect to be the most difficult visual search for someone to complete? Question 10 options: Finding Pink construction paper within a stack of colored paper Finding a Yellow highlighter in a drawer full of colored highlighters and markers Finding a red sock among

Part A 1) What is the idea behind frequency distribution? 2) Which is the common sampling method? 3) What is the measure of central tendency called? 4) What observation basically describes a sample size? 5) What is the measure of dispersion from a mean called? 6) Sample mean or the population mean: which varies the most? 7) Sample mean or

age(y)36233520161330133455 2. About the variable: AGE a. What is the scale of measurement (NOIR)? b. What is the mean? c. What is the median? Describe the shape of the distribution of AGE? : Is the data normal or skewed in its distribution. If skewed, is it negatively skewed or positively skewed
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Loftus and Palmer (1974) conducted a famous study that showed how our memories can be deceiving and that a simple change of wording can alter our recall of events. In a typical study, participants watch a video of a car accident (a moving car colliding with a parked car) and then are asked to indicate how fast the car was traveling when it
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A random sample of 40 people was asked if they had watched the current episode of a hit television series. The following data represent their responses. Complete parts a through c. no no yes no no no no no no yes no no yes no yes yes no yes no no no no no no no no no no yes no no no no no no no yes no yes no a. Calculate the proportion of viewers
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QUESTION 1 Given the model y = + 1 X 1 + 2 X 2 + 3 X 3 + and n = 20, what are the degrees of freedom on the error? A. 16 B. 19 C. 17 D. 20 QUESTION 2 Given y-hat = 25 + 7.5X 1 +26.5X 2 - 4.1X 1 X 2 , what is the predicted value of y when X 1 = 15 and X 2 = 3? A. 25 B. 32.5 C. 224.5 D. 409.3 QUESTION 3 Refer to problem 2. What is the residual when
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Criminologists have long debated whether there is a relationship between weather conditions and the incidence of violent crime. The author of an article classified 1362 homicides according to season, resulting in the accompanying data. Test the null hypothesis of equal proportions using a = 0.01. Winter Spring Summer Fall 329 332 375 326 State the
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19. Example 12.4 and the table below provide the results of a study in Australia showing that the couples in the study had a higher risk of separation if the wife's parents had been divorced. The numbers are shown again in the table below. Wife's Parents Divorced? Couple Separated Couple Intact Total Yes 42 292 334 No 72 1,092 1,164 Total 114

Part B: Show all work and formulas. 1.) With the following randomly selected observations: a) Determine the Regression Equation. b) Determine the value of Y hat when X is 7 X Y XY X 2 5 13 3 15 6 7 3 12 4 13 4 11 6 9 8 5

How to perform two way a nova test ( including month moon and admission rate)? trying to enter data into spss and having trou because no recieving d, f, and sig http://www.statsci.org/data/general/fullmoon.html data set

What is the coefficient of multiple determination? What are its properties? What are the differences between the coefficient of multiple determination and the adjusted coefficient of multiple determination? Which are the possible tests that may be used to make inferences about the slope of a simple linear regression line? Briefly explain each of

Stat 2 Lab #9: Regression - Residual plots, "slice problems," and review Learning objectives: Calculate the slope and intercept of the regression line Interpret the slope and intercept of the regression line Identify and apply the correct calculation in an applied regression problem Calculate RMS Error for regression and baseline prediction

Why is it desirable to examine temperature statistics as opposed to actual temperatures when determining the potential of global warming? Group of answer choices The long-term trend can be masked by year-to-year variations. Actual temperature data is of little climatological value. Statistical analyses are always 100% accurate

Answer a question 16. Flight Delays Data Set 15 in Appendix B lists 48 different departure delay times (minutes) for American Airlines flights from New York (JFK) to Los Angeles. Negative departure delay times correspond to flights that departed early. The mean of the 48 times is 10.5 min and the standard deviation is 30.8 min. Use a 0.01
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Points: Define each of the following terms. (a) Point estimate (b) Confidence interval (c) Level of confidence (d) Margin of error Confidence interval |Margin of error |Point estimate Level of confidence Drag each of the terms given above into the appropriate definition below. A range of numbers based on a point estimate of an unknown parameter
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Suppose X(t) is an independent-increment process with X(0) = 0 for all samples. Prove or disprove X(t) is a Markov process.

The mean amount spent by a family of four on food per month is $507 with a standard deviation of $73.Assuming that the food costs are normally distributed. a.what is the probability that a family spends less than $406 per month? Giveyour answer to 4decimals. b.what is the probability that a family spends at least $711 per month?Giveyour answer to

Research question: "Is there an effect of DOGS (predictor/ independent variable) on STRESS LEVELS (outcome/dependent variable) ?" Hypothesis: There is an effect of dog ownership on lowered stress levels than those who do not own a dog

Assume that when adults with smartphones are randomly selected, 37 % use them in meetings or classes. If 7 adult smartphone users are randomly selected, find the probability that exactly 3 of them use their smartphones in meetings or classes. The probability is:

4.Major League Baseball (MLB) has recently been evaluating the timing of various events during games in a effort to improve the pace of a game. MLB wants to know how long a mound visit, defined as when a coach pauses the game to visit the pitcher on the mound, takes on average. MLB randomly selects 100 games over the course of a season, and

8. The within-treatment variation reflects: a. variation among individuals of the same group. b. variation between individuals in different groups. c. variation explained by factors included in the ANOVA model. d. variation that is not part of the ANOVA model.

4.-b) A certain technology-based mutual funds reports a rate of return of 12.4%, while the mean rate of return for comparable funds is = 7.8% and standard deviation = 2.1%. Calculate the z-score for this particular mutual fund. Is it unusual? Answer: Z-score =2.19 Is it unusual? YES NO because: its rate of return is significantly higher than the

17. In a national survey, 1,500 randomly selected adults will be asked if they favor or oppose a ban on texting while driving and if they have personally texted while driving during the previous month. Write null and alternative hypotheses about the relationship between the two variables in this situation. Make your hypotheses specific to this

Conceive two separate cases where you might want to use measures of central tendency and dispersion for point data.One example should be from the human side of geography, and the other should come from the physical side.

Fifty randomly selected students were asked the number of speeding tickets they have had. The results are as follows: Tickets/Frequency 0 / 8 1 / 15 2 / 21 3 / 3 4 / 2 5 / 0 6 / 1 Find the 40th Percentile: __________ What percent have received at least 4 tickets? ____________-

Choose the correct answer inside the brackets. (a) The higher the precision, the [shorter, wider] the confidence interval for , holding everything else constant. (b) Increasing the level of confidence, holding everything else constant, [increases/decreases] precision in estimating , holding everything else constant. (c) The higher the variance of

To examine the interaction effect between Education and Gender, follow-up tests need to be performed. Answer the following questions based on the follow-up test results. Hint: To see how the effect of Education on Salary varies by gender, we need to examine the effect of Education on Salary in each gender group, separately, and then compare the

The scholarship committee has five awards for top students. They are considering 34 applicants, and 14 of the candidates are majoring in mathematics. a. How many ways can all five awards be given to students majoring in mathematics

Hours of sitting per day significantly predicts the amount of weight gain (in 6 months). The regression equation is WeightGain = 7 + 0.49 * HoursSit. Data are from 120 full-time employees in a public urban university. With a standard error for the slope (SE_b1) of 0.02, what is the 95% confidence interval of the slope. 95%CI:(6.9608, 7.0392),

The average age of the population of licensed drivers in a county is = 42.6, = 12, and the distribution is approximately normal. A county police officer was interested in whether the average age of drivers receiving parking tickets differed from the average age of the driving population. She obtained a sample of N = 25 drivers receiving parking

TH 1530 Online - Section 201 Homework: Self-Check 3.2 Score: 0 of 1 pt 4 of 7 (6 complete) 4.1.33 The histogram shows the distribution of hurricanes that have hit a country from 1851 through 2015, where weakest level and 5 is the strongest level. (a) Find the mean, variance, and standard deviation of the probability distribution. (b) Interpret the

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