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A company claims that the time their customers spend waiting in line for service is normally distributed with a mean of21.4 minutes and a standard

A company claims that the time their customers spend waiting in line for service is normally distributed with a mean of21.4 minutes and a standard deviation of7.2 minutes.

Approximately10% of the customers can expect to wait as long as how many minutes for service?

A28.6

B30.6

C38.6

D33.3

E21.4

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