What is the probability that the sample mean

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According to a report from a business intelligence? company, smartphone owners are using an average of 20 apps per month. Assume that number of apps used per month by smartphone owners is normally distributed and that the standard deviation is 4. 

Problem a. If you select a random sample of 25 smartphone? owners, what is the probability that the sample mean is between 19.5 and 20.5??

Reference no: EM132864736

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