- Press 2nd VARS to get to the DISTR menu.
- Press the down arrow key to scroll down until binomcdf is highlighted and press ENTER.
- Input the number of trials, n.
- Press the comma key.
- Input the probability of success on a single trial, p, formatted as a decimal.
- Press the comma key.
- Input the number of successes, r.
- Press the ) key.
- Press ENTER to compute the probability.
Old Operating System Manual