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Suppose that water usages in American showers are normally distributed with an average shower using...

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Suppose that water usages in American showers are normally distributed with an average shower using 18 9 gallons and a standard deviation of 3 6 gallons Estimate the percentage of showers that used a between 15 3 and 22 5 gallons b more than 26 1 gallons c less than 8 1 gallons d between 8 1 and 26 1 gallons

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