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Procter & Gamble reported that an American family of four washes an average of 2100 pounds...

Procter & Gamble reported that an American family of four washes an average of 2100 pounds of 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 will be

a. between 2020 and 2150 pounds b. less than 2130 pounds c. greater than 2050 pounds

Math   Statistics-And-Probability   
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