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Scientists want to estimate the mean weight of mice after they have been fed a special diet. From previous studies, it is known that the

Scientists want to estimate the mean weight of mice after they have been fed a special diet. From previous studies, it is known that the weight is normally distributed with a standard deviation 2 grams. How many mice must be weighed so that a 95% confidence interval will have margin of error of 0.5 grams? Write only an integer as your answer

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