Question 764317: A recent Consumer Report article Jenny and Stephanie were reading reported that the mean number of gallons of gas consumed by a "typical American household" in a year is 750 and the standard deviation is 37 gallons. Assuming the data are normally distributed, what percentage of American households consume less that 713 gallons?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A recent Consumer Report article Jenny and Stephanie were reading reported that the mean number of gallons of gas consumed by a "typical American household" in a year is 750 and the standard deviation is 37 gallons. Assuming the data are normally distributed, what percentage of American households consume less than 713 gallons?
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z(713) = (713-750)/37 = -1
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P(x < 713) = P(z < -1) = normalcdf(-100,-1) = 0.1587 = 15.87%
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Cheers,
Stan H.
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