Question 1147981
Go to a z-table and find the z-score where the area to the left of the curve is closest to 0.03.  The z-score that is the closest is -1.88.
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Set up the equation as such:
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{{{(x - mean)/SD = Zscore}}}
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{{{(x - 20.26)/2.8 = -1.88}}}
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x - 20.26 = -1.88(2.8)
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x - 20.26 = -5.264
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x = 14.996
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The weight a watermelon needs to be not to be discarded is 14.996 lbs.