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A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the variance to be 3.61 .

A toy manufacturer wants to know how many new toys children buy each year. Assume a previous study found the variance to be 3.61

. He thinks the mean is 7

toys per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.12

at the 85%

level of confidence? Round your answer up to the next integer.

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