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Suppose Mcdonalds has recently opened an express line for beverage orders only. The waiting time from the time you get in the express line until

Suppose Mcdonalds has recently opened an express line for beverage orders only. The waiting time from the time you get in the express line until the time you get your drink order is normally distributed with a mean of 11.7 minutes and an unknown standard deviation . If 74% of the time you wait less than 14.7 minutes, what is the value of the standard deviation?

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