MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Ava's morning routine is normally distributed and independent. She has been tracking her time from when she leaves to house to when returns all year. The mean time is 14 minutes and the standard deviation is 1.5 minutes. Suppose two mornings are randomly selected.

Find the probability that the first morning selected is more than 2 minutes greater than the second morning time?   

Interpret this probability.

 
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Step 1

Let X and Y are the first and second mornings.

It is given that X and Y are independent and identically distributed (i.i.d) as normal with mean of 14 minutes and a standard deviation of 1.5.

It is known that the difference of two independent normal random variables is also a normal random variable.

That is, (X–Y) is also a normal random variable.

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