w=30, s =50,s*exp(-w^2/(2*s^2))/sqrt(2*pi) + (w/2)*erfc(-w/(s*sqrt(2)))

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.