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The per capita consumption of coffee by people in the United States in a recent year was normally distributed, with a mean of 24.2 gallons and a standard deviation of 8.1 gallons.
What proportion of people in the U.S. drink more than 20 gallons of coffee a year?

  • stats - ,

    Use z-scores.

    Formula:
    z = (x - mean)/sd

    x = 20
    mean = 24.2
    sd = 8.1

    Plug the values into the formula and calculate z. Then check a z-table using the z-score for the proportion of people who drink more than 20 gallons.

    I hope this will help get you started.

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