Procter & Gamble reported than an American family of four washes an average of 1 ton (2000
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Question:
Procter & Gamble reported than an American family of four washes an average of 1 ton (2000 pounds) of the clothes each year. If the standard deviation of the distribution is 187.5 pounds, find the probability that the mean of a randomly selected sample of 50 families of four will between 1980 and 1990 pounds.
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