Question: AP tests again: During a recent academic year, approximately 1.7 million students took one or more AP tests. Following is the frequency distribution of the

AP tests again: During a recent academic year, approximately 1.7 million students took one or more AP tests. Following is the frequency distribution of the number of AP tests taken by students who took one or more AP tests. Number of Tests Frequency (in 1000s) 234 1 2 3 953 423

Let X represent the number of exams taken by a student who took one or more.

a. Construct the probability distribution for X.

b. Find the probability that a student took exactly one exam.

c. Compute the mean ????X.

d. Compute the standard deviation ????X.

Number of Tests Frequency (in 1000s) 234 1 2 3 953 423 194 80 5 6 7 29 9 3 8 1 Total 1692

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