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A national park has been divided into 80 zones. A survey is taken with the aim of obtaining the number of zebras in the park.

A national park has been divided into 80 zones. A survey is taken with the aim of obtaining the number of zebras in the park. Suppose that 35% of the 80 zones are assumed to be inhabited by zebras and each of the zones is assumed to be large, how large a sample of the 80 zones should be selected in order to obtain an estimate of the population proportion with 95% confidence

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