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A random sample of 20 employees was collected from Brac University, to estimate the average daily time they spent on social media. Suppose that the

A random sample of 20 employees was collected from Brac University, to estimate the average daily time they spent on social media. Suppose that the population times have a normal distribution with a mean of 85 minutes and a standard deviation of 13 minutes. (answer in three decimal places)

What is the probability that the sample mean is outside the range of 77 to 90 minutes?

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