Question: Time spent using email per session is normally distributed with of 8 minutes, with a population standard deviation () of 2 minutes.A sample of 25

Time spent using email per session is normally distributed with of 8 minutes, with a population standard deviation () of 2 minutes.A sample of 25 sessions is drawn.

What is the probability that a sample mean will be between 7.8 and 8.2 minutes

What is the probability that a sample mean will be between 7.5 and 8.0 minutes

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