Question 4 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: a) What is the amount of time below which only 15% of all students spend studying? b) What is the amount of time above which only one third of all students spend studying? nhuhility that a student spends between 16 and 20 hours studying?
Question 4 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: a) What is the amount of time below which only 15% of all students spend studying? b) What is the amount of time above which only one third of all students spend studying? nhuhility that a student spends between 16 and 20 hours studying?
MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
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Transcribed Image Text:Question 4
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:
a) What is the amount of time below which only 15% of all students spend studying?
b) What is the amount of time above which only one third of all students spend studying?
c) What is the probability that a student spends between 16 and 20 hours studying?
d) What is the probability that a student spends at least 15 hours studying?
What is the probability that a student spends at most 18 hours studying?
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