Question: On a test given to 900 students, the mean grade was 72.7, with a standard deviation of 8.56. Assuming a normal distribution, estimate the following.

On a test given to 900 students, the mean grade was 72.7, with a standard deviation of 8.56. Assuming a normal distribution, estimate the following.

a)The number of students who got a B grade, (between 70 and79).

b)The number of students who got an C grade, (between 60 and 69).

c)The number of students who scored more than 90.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

Q:

Answer f4 On a test given to 2000 students, the mean grade was u=72.6, with a standard deviation, 6 = 9.43. Assuming a normal distribution, estimate the following. a) The number of students who got...

Q:

Answer f4 On a test given to 2000 students, the mean grade was u=72.6, with a standard deviation, 6 = 9.43. Assuming a normal distribution, estimate the following. a) The number of students who got...

Q:

Page 1 of 10 Answer Sheet Instructions: This is an open-book exam. You may refer to your text and other course materials as you work on the exam, and you may use a calculator. Page 2 of 10 Record...

Q:

STAT 200: Introduction to Statistics Final Examination, Fall 2017 OL4 Page 1 of 9 STAT 200 OL4/US2 Sections Final Exam Fall 2017 The final exam will be posted at 12:01 am on December 15, and it is...

Q:

Hi, i need assistance with Math homework. thank you Assignment 1 1. Consider a family of three children. Find the following probabilities. a. P (two girls and a boy) b. P (at least one girl) c. P...

Q:

1. For each Claim below, write: (1) claim in mathematical form; (2) Null hypothesis (Ho); (3) alternative hypothesis (H,); (4) what tailed test. Use notations Hi. Hz (for mean), P-Pz (for...

Q:

1. Two hundred students took a standard chemistry test. You sampled 20 students to estimate the average score and the standard deviation. How many degrees of freedom were there in the estimation of...

Q:

SET A: 1. For each Claim below, write: (1) claim in mathematical form; (2) Null hypothesis (Ho); (3) alternative hypothesis (H,); (4) what tailed test. Use notations Hi. Hz (for mean), P-Pz (for...

Q:

Estimate the mean and the standard deviation of the normal distribution shown. Each mark represents 1 unit. O u=3,o=1.2 O u=4,o=3 O u=2.o=.7 O u=3,o=0.8 At the Stop-and-Shop, shoppers can order their...

Q:

PROBSTATS1 1. For Each Claim below, write: (1) claim in mathematical form; (2) Null hypothesis (Ho); (3) alternative hypothesis (H,); (4) what tailed test. Use notations Hi. Hz (for mean), P-Pz (for...

Q:

Five cards are dealt from a standard 52-card deck. What is the probability that the sum of the faces on the five cards is 48 or more?

Q:

Would you rather own your own business independently or become a franchisee? Why?

Q:

. Which of the following situations results in a contingent liability? a . Making a credit card sale b . Dishonoring a note c . Estimating uncollectible accounts expense d . Discounting a note

Q:

Why does London dominate the foreign exchange market even though much global currency trading takes place in London, New York, and Tokyo?

Q:

Peoples understanding of what is being said

Q:

5. Develop a circular model, with positive and negative feedback loops, showing the relationships between the following critical variables: The population of a city Industrialization Relocation ...

Q:

The quality of the proposed ideas