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On average, it takes a shoe factory 21 minutes, with a standard deviation of 3 minutes, to manufacture a pair of running shoes. How
often will it take the factory more than 27 minutes to manufacture a pair of running shoes?
Note: Assume that a Normal model is appropriate for the distribution of manufacturing times.
OA. It takes the factory more than 27 minutes to manufacture a pair of running shoes about 5% of the time.
OB. It takes the factory more than 27 minutes to manufacture a pair of running shoes about 2.5% of the time.
OC. It takes the factory more than 27 minutes to manufacture a pair of running shoes about 95% of the time.
OD. It takes the factory more than 27 minutes to manufacture a pair of running shoes about 47.5% of the time.
Sagot :
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