What percent of the sample means will be greater than 160, Ask an Expert

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CRA CDs Inc. wants the mean lengths of the "cuts" on a CD to be 155 seconds (2 minutes and 35 seconds). 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 the cuts follows the normal distribution with a population standard deviation of 10 seconds. Suppose we select a sample of 25 cuts from various CDs sold by CRA CDs Inc. What percent of the sample means will be greater than 160 seconds? What percent of the sample means will be greater than 147 but less than 160 seconds?

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