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A calculus instructor uses computer aided instruction and allows students to take the e.x.a.m as many...

A calculus instructor uses computer aided instruction and allows students to take the e.x.a.m as many times as needed until a passing grade is obtained. Following is a record of the number of students in a class of 40 who took the test each number of times.

Students

Number of Tests

20

1

10

2

7

3

3

4

a) Find the expected value of the number of tests taken.

b) Compute the variance and the standard deviation of the number of tests taken.

Math   Statistics-And-Probability   
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