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.
(integrate 1/(15*sqrt(2*pi)) * e^-((x-100)^2 / (2*15^2)) from m to inf) / (integrate 1/(15*sqrt(2*pi)) * e^-((x-100)^2 / (2*15^2)) from 131 to inf) = 1000/60000
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random