Please help me answer these college math problems

Find the mean for the following group of data items.

7.6,6.5,9.7,6.1,3.7,1.2,8.5,4.9,8.7,4.4,3.2

Part 1

The mean is _____

enter your response here.

?(Round to 3 decimal places as? needed.)

Find the median for the following group of data items.

Part 2.

8,13,6,5,12,7,14,11

Question content area bottom

The median is

enter your response here.

?(Type an integer or a? decimal.)

Part 3.

Find the mode.

42?, 44?, 31?, 33?, 43?, 43?,38

Select the correct choice below? and, if? necessary, fill in the answer box to complete your choice.

A.

The mode is

enter your response here.

?(Use a comma to separate answers as? needed.)

B.There is no mode.

Part 4.

Find the range for the group of data items.

19?, 20?, 21?, 22?, 23

The range is

enter your response here.

Part 5.

Find the standard deviation for the group of data items.

9?, 10?, 11?, 12?,13

The standard deviation is ____enter your response here.

?(Round to two decimal places as? needed.)

Part 6.

Use the data 0?, 2?, 3?, 6?, 6?, 7 Add 2 to each of the numbers. How does this affect the? mean? How does this affect the standard? deviation?

Choose the correct answer below.

A.The mean will be increased by 2?, and the standard deviation will remain the same.

B.The standard deviation will be increased by 2?, and the mean will remain the same.

C.Both of the mean and the standard deviation will remain the same.

D. Both of the mean and the standard deviation will be increased.

Part 7.

A set of data items is normally distributed with a mean of 60 and a standard deviation of

6. Convert 60 to a? z-score.

z60=enter your response here

(Do not round until the final answer. Then round to the nearest hundredth as? needed.)

Part 8.

Scores on a dental anxiety scale range from 0? (no anxiety) to 20? (extreme anxiety). The scores are normally distributed with a mean of 11 and a standard deviation of 4. Find the? z-score for the given score on this dental anxiety scale.

13

z13= ______

?(Type an integer or a? decimal.)

Part 9.

Cholesterol levels are normally distributed. For people between the ages of 18 and 24 the mean is 178.1. Convert the given score to a? z-score, using the standard deviation of 40.7.??

What percentage of people in this age range have a cholesterol level between 154.5 and? 222.2???

_________%

?(Round to two decimal places as? needed.)

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Not everyone pays the same price for the same model of a car. The figure illustrates a normal distribution for the prices paid for a particular model of a new car. The mean is $22,000 and the Number of Car Buyers standard deviation is $1000. Use the 68-95-99.7 Rule to find what percentage of buyers paid between $21,000 and $23,000. The percentage of buyers who paid between $21,000 and $23,000 isConstruct a grouped frequency distribution for the data to the right, showing the length, in miles, of 25 rivers. Use 2570 2330 1980 1910 1910 five classes that have the same width. 1480 1470 1450 1250 1200 1190 1150 1090 1020 930 896 388 866 792 785 744 726 690 663 641 Select the correct choice below and fill in any answer boxes within your choice. O A. O B. O C. Length Frequency Length Frequency Length Frequency 500-899 500-999 500-999 900-1499 1000-1399 1000-1499 1500-1999 1400-2099 1500-1999 2000-2299 2100-2499 2000-2499 2300-3000 2500-2999 2500-2999 () Time Remaining: 02:35:10 Next earch Eli