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May 9th, 2017, 03:09 PM   #1
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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
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May 9th, 2017, 03:30 PM   #2
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$1-\Phi\left(\dfrac{30-18.9}{4.5}\right) = 0.68\%$
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