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Answer :
Note that "middle 99.7%" signifies "within 3 standard deviations of the mean."
Thus, add 3 standard deviations to the mean (90 lb) to get the high end weight and subtract 3 std devs to get the low end weight:
90 lb + 3(3.5 lb) = 100.5 lb
90 lb - 3(3.5 lb) = 79.5 lb
So the middle
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