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.
\frac{124+0.5-0.47\cdot 250}{\sqrt{250\cdot 0.47\cdot (1-0.47)}}
\frac{124+0.5-0.47\cdot 250}{\sqrt{250\cdot 0.47\cdot (1-0.47)}}
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random