Selecting a random sample from sessions

Reference no: EM1393185

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 the sample mean is between 7.8 and 8.2 minutes?

Reference no: EM1393185

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