SOLUTION: A survey of college students was conducted during final exam week to assess the number of hours spent studying each day. The mean number of hours was 5 with a standard deviation of

Question 1168037: A survey of college students was conducted during final exam week to assess the number of hours spent studying each day. The mean number of hours was 5 with a standard deviation of 1.5 hours. The distribution was normal.
3.What percentage of students studied 7 or more hours per day?
I got 9.18% am i correct?

4.What percentage of students studied 2 or more hours per day?
i got 2.28% am i correct?

5.What percentage of students studied between 2 and 7 hours per day?
i got 88.56& am i correct?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mean)/sd
=2/1.5=1.33
so want z>1.33
you are correct.
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Think about the second--2 hours or more a day should be just about all of them
want z>-2 and that is the complement of your answer, so you want 97.72%
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between 2 and 7: Greater than 2 is 97.78, subtract greater than 7 which you don't want and the answer is 97.72-9.17 or 88.55% very close to yours.
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