Cra cdsinc wants the mean lengths of the cuts on a cd to be, Ask an Expert

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CRA Cdsinc. wants the mean lengths of the "cuts" on a cd to be 135 seconds (2 min and 15 sec). This will allow the disk jockeys to have plenty of time for commercials within each 10 minute segment. Assume the distribution of the length of cuts follows the normal distribution with a population standard deviation of 8 sec. Suppose we select a sample of 16 cuts from various cd's sold CRA cdsinc.

A. what can we say about the shape of the distribution of the sample mean?

B. what is the standard error of the mean?

C. what percent of the sample means will be greater than 140 sec?

D. what percent of the sample means will be greater than 128 seconds?

E. what percent of the sample means will be greater than 128 but less than 140?

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