Question

A citrus grower offers gourmet gift boxes of 6 Ruby Red grapefruits. The grapefruits used in these boxes weigh an average of 18 ounces with a standard deviation of 1.2 ounces. Assuming the weights are approximately normally distributed, what is the probability that the average weight of the Ruby in one of these boxes is between 17.5 and 18.5  ounces?

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