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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 $1-\Phi\left(\dfrac{30-18.9}{4.5}\right) = 0.68\%$

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