According to a report from a business intelligence​ company, smartphone owners are using an average of 16 apps per month. Assume that number of apps used per month by smartphone owners is normally distributed and that the standard deviation is 7. Complete parts​ (a) through​ (d) below. a. If you select a random sample of 16 smartphone​ owners, what is the probability that the sample mean is between 15.5 and 16.5​?

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