Question: A calculus instructor uses computer aided instruction and allows students to take the midterm exam as many times as needed until a passing grade is

A calculus instructor uses computer aided instruction and allows students to take the midterm exam 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.

.

Find the expected value of the number of tests taken.

(8

points

)

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

(10

points

)

A calculus instructor uses computer aided instruction and allows students to

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