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The delivery times for all food orders at a fast-food restaurant during the lunch are normally distributed with a mean of 7.7 minutes and a

The delivery times for all food orders at a fast-food restaurant during the lunch are normally distributed with a mean of 7.7 minutes and a standard deviation of 2.1 minutes. Let x-bar be the mean delivery time for a random sample of 16 such orders at this restaurant.

Find the mean and standard deviation of x bar

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