An employment agency wants to estimate the average number of people who will respond to one of their ads. If $\sigma=40$ people, how large a sample is needed to be able to assert with probability 0.95 that the estimate will be off by at most 10 people?

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The Answer of An employment agency wants to estimate the average number of people who will respond to one of their ads. If $\sigma=40$ people, how large a sample is needed to be able to assert with probability 0.95 that the estimate will be off by at most 10 people?

An Employment Agency Wants to Estimate the Average Number of People