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3. The weight of cell phones is normally distributed. The mean weight of a sample of 300 cell phones is 112 grams, with a

3. The weight of cell phones is normally distributed. The mean weight of a sample of 300 cell phones is 112 grams, with a standard deviation of 2 grams. With a 95% confidence level, determine the maxi error of estimate. 22.63% 29.73% 18.99% 1.31%

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