Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
variance 12, 13, 8, 13, 9, 11, 12, 9, 11
variance 12, 13, 8, 13, 9, 11, 12, 9, 11
Natural Language
Math Input
Extended Keyboard
