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Birth weights of babies born to full-term pregnancies follow roughly a Normal distribution.

Birth weights of babies born to full-term pregnancies follow roughly a Normal distribution. At Meadowbrook Hospital, the mean weight of babies born to full-term pregnancies is 7 lbs with a standard deviation of 14 oz (1 lb = 16 oz).

What is the probability that the average weight of the four babies will be less than 7.5 lbs?

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