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.
((0.5x(3-3.7)^2+0.3x(3-4)^2+0.2x(3-5)^2)/(1x))^(1/2)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random