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5. Assume that the weight of all packages of a certain brand of cookies are normally distributed with a mean of 32 ounces and a

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5. Assume that the weight of all packages of a certain brand of cookies are normally distributed with a mean of 32 ounces and a standard deviation of 0.3 ounces. Find the probability that: a. The mean of 1 box is between 31.8 and 31.9 ounces b. The mean weight of 20 boxes is between 32.1 and 31.9 ounces

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