Wednesday

July 23, 2014

July 23, 2014

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.

**Related Questions**

statistics - The U.S. Department of Agriculture claims that the mean consumption...

statistics research - What proportion of adults use between 15 and 23 gallons of...

Math Statistics - The annual per capita consumption of fresh apples (in pounds) ...

Statistics Math - The annual per capita consumption of fresh apples (in pounds) ...

Statistics - The daily water consumption for an Ohio community is normally ...

statistics - The U.S. Dairy Industry wants to estimate the mean yearly milk ...

statistics - what is the proportion of people who drink more than 20 gallons of ...

statistics - The U.S. Dairy Industry wants to estimate the mean yearly milk ...

Statistics - The time required to make 900 gallons of synthetic rubber at a ...

math - Suppose the weekly use of gasoline for motor travel by adults in North ...