In 2012, MetricNet found that the average length of a phone call to a help desk was about ten minutes. Call times were strongly right skewed with a standard deviation around 3.5 minutes. Suppose we take a random sample of 50 calls to the help desk and find the average (x̅) calls duration for the 50 calls. We repeat this process many times.

(a) What do you expect the mean of the x̅ to be?

(b) What do you expect the standard deviation of the x̅ to be?

(c) What do you expect the shape of the x̅ to be? What guarantees this fact?

Answer rating: 100% (QA)

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