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According to a report from a business intelligencecompany, smartphone owners are using an average of 21 apps per month. Assume that number of apps used

According to a report from a business intelligencecompany, smartphone owners are using an average of 21 apps per month. Assume that number of apps used per month by smartphone owners is normally distributed and that the standard deviation is 3.

If you select a random sample of 16 smartphoneowners, what is the probability that the sample mean is between 20.5 and 21.5?

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