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March 27, 2015

Homework Help: Stats Anyone?

Posted by CM on Wednesday, October 28, 2009 at 2:40am.

The first-year retention rate is the percentage of entering freshman at a given college who return to that same college for their sophomore year. Many colleges use the first-year retention rate as one measure of their quality. Suppose that the first-year retention rate at a given college is 75% (a typical number).

a. One dormitory suite holds six first-year students. What is the probability that at least four of those students return for their sophomore year?

b. Suppose that this college admits 500 new first-year students every year, and has had a retention rate of 75% for a long time. What is the mean number of students who return for their sophomore year? What is the standard deviation for this number?

c. What is the probability that, in a given year, no more than 350 first-year students return for their sophomore year?

d. Suppose that in a given year, 410 students return for their sophomore year. Is this unusually high? Explain your answer.

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