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Posted by **jackie** on Friday, April 6, 2012 at 1:03pm.

What proportion of people in the U.S. drink more than 20 gallons of coffee a year?

- stats -
**MathGuru**, Friday, April 6, 2012 at 5:41pmUse 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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