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May 9th, 2017, 03:09 PM  #1 
Newbie Joined: May 2017 From: texas Posts: 1 Thanks: 0  Stats fraction
If a pizza place give you free pizza after 30 minutes or less and the mean is 18.9 with a standard deviation on 4.5 what fraction of the customers gets free pizza? help pleaseee

May 9th, 2017, 03:30 PM  #2 
Senior Member Joined: Sep 2015 From: CA Posts: 1,206 Thanks: 614 
$1\Phi\left(\dfrac{3018.9}{4.5}\right) = 0.68\%$


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