- Press 2nd VARS to get to the DISTR menu.
- Press the down arrow key to highlight normalcdf, and press ENTER.
- Input the left endpoint, and press the comma key.
- Input the right endpoint and press ).
- Press ENTER. The calculator should display the area under the normal curve between the two specified endpoints (remember: use -100 for an infinite left endpoint, and 100 for an infinite right endpoint).
Old Operating System Manual