Cra cds inc. wishes mean lengths of cuts on a cd to be 132, Ask an Expert

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CRA CDs Inc. wishes mean lengths of "cuts" on a CD to be 132 seconds (2 minutes and 12 seconds). This will permit disk jockeys to have plenty of time for commercials in each 10-minute segment. suppose distribution of the length of cuts follows normal distribution with population standard deviation of 7 seconds. Assume we choose a sample of 18 cuts from various CDs sold by CRA CDs Inc.

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