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John surfs the website on a regular basis. Suppose the time he spent surfing the website per day is normally distributed, = 8 minutes and

John surfs the website on a regular basis. Suppose the time he spent surfing the website per day is normally distributed, = 8 minutes and = 2 minutes.

If you select a random sample of 4 sessions,

a. What is the probability that the sample mean is less than 8 minutes? Explain

b. What is the probability that sample mean is between 8 and 10 minutes?

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