SOLUTION: In a study of the time college freshmen use to study each week, it is found that the mean is 6.8 hours with a standard deviation of 2.5 hours. If 100 freshmen are randomly select

Question 437771: In a study of the time college freshmen use to study each week, it is found that the
mean is 6.8 hours with a standard deviation of 2.5 hours. If 100 freshmen are
randomly selected, what is the probability that their mean weekly study time
exceeds seven hours?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi

*Note: 

In a study of the time college freshmen use to study each week,

mean is 6.8 hours with a standard deviation of 2.5 hours

Sample size n = 100 Find: P(X > 7hr)   

 z = (7-6.8)/(2.5/10) = .2/.25 = .8

P(z >.8) = 1 - .7881 = .2119 

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