(Solution Download) Probability

A study of college freshens study habits found that the time (in hours) that college freshmen use to study each week is approximately normally distributed with a mean of


7.2 hours and a standard deviation of 5.3 hours.


A)What is the probability that a randomly chosen freshmen studies more than twice the average number in hours?(sketch required)


B)What are the mean and standard deviation for the average number of hours Xbar spent studying by an SRS of 55 freshmen?


C) what is the probability rhat the average number of hours spent studying of an SRS of 55 students is greater than 10.2 hours?


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