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We want to estimate the mean age of students at a local college. From previous information, we estimate that the standard deviation of the ages

We want to estimate the mean age of students at a local college. From previous information, we estimate that the standard deviation of the ages of the students is 15 years. We want to be 95% confident that the sample mean age is within 2 years of the population mean age. How many randomly selected students at this local college must be surveyed to achieve this desired result

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