The amount of time devoted to studying statistics each week by students who achieve a grade of A in the course is a normally distributed random variable, with a mean of 7.5 hours and a standard deviation of 2.1 hours. Also indicate whether the event is usual or unusual   A.  What proportion of A students study more than 10 hours per week  B.  Find the probability that an A student spends between 7 and 9 hours studying  C.  What proportion of A students spend fewer than 3 hours studying   *Please do not solve using Microsoft Excel.  My professor is not teaching using excel.  I would like to see the steps involved to solving the problem for my own study reference for exams.*

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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The amount of time devoted to studying statistics each week by students who achieve a grade of A in the course is a normally distributed random variable, with a mean of 7.5 hours and a standard deviation of 2.1 hours. Also indicate whether the event is usual or unusual

 

A.  What proportion of A students study more than 10 hours per week 

B.  Find the probability that an A student spends between 7 and 9 hours studying 

C.  What proportion of A students spend fewer than 3 hours studying

 

*Please do not solve using Microsoft Excel.  My professor is not teaching using excel.  I would like to see the steps involved to solving the problem for my own study reference for exams.*

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The amount of time devoted to preparing for a statistics examination by students is a normally distributed random variable with a mean of 17 hours and a standard deviation of 5 hours. Required:

d) What is the probability that a student spends at least 15 hours studying?
e) What is the probability that a student spends at most 18 hours studying?

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