Find probability that sample mean is between range, Basic Statistics

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Find probability that sample mean is between range

Time spent using email per session is normally distributed with μ = 8 minutes and σ = 2 minutes.

a. What is the probability that the sample mean is between 7.8 and 8.2 minutes?
b. What is the probability that the sample mean is between 7.5 and 8 minutes?
c. If you select a random sample of 100 sessions, what is the probability that t he sample mean is between 7.8 and 8.2 minutes?

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Basic Statistics: Find probability that sample mean is between range

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