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Suppose a certain species bird has an average weight ofx=3.55grams. Based on previous studies, we can assume that the weights of these birds have a

Suppose a certain species bird has an average weight ofx=3.55grams. Based on previous studies, we can assume that the weights of these birds have a normal distribution with0=0.29 grams. Find the sample size necessary for an 85% confidence level with a maximal error of estimatefor the E=0.09 mean weights of the hummingbirds.

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