16, 21, 21, 22, 22, 23, 24, 24, 25, 25, 25, 25, 26, 26, 26, 26, 27, 27, 28, 20, 29, 29, 31, 32, 33, 33, 35, 35, 36, 37

- August 6th 2007, 05:23 AMprincess_anna57Find the variance and standard deviation of this set of data?
16, 21, 21, 22, 22, 23, 24, 24, 25, 25, 25, 25, 26, 26, 26, 26, 27, 27, 28, 20, 29, 29, 31, 32, 33, 33, 35, 35, 36, 37

- August 6th 2007, 06:00 AMtopsquark
<-- variance

where

and

<-- standard deviation

Depending on the kind of statistic you are trying to work with the might be a . You'll have to check your text or your notes to make sure.

So the first thing to is to calculate the average, , then use that to find the variance.

-Dan - August 6th 2007, 06:20 AMprincess_anna57
The mean is 26.73. Now what do I do? ^_^

It's 1/N by the way. - August 6th 2007, 06:47 AMtopsquark
- August 6th 2007, 06:58 AMprincess_anna57
Cool beans. How about the standard deviation?

- August 6th 2007, 07:19 AMtopsquark