You can find probability distributions under the bá menu and follow these steps:
1. Select 1: Normal... and press =.
2. Select normalcdf( for a normal probability.
3. Press =. The stat wizard prompts for lower and upper bounds. -1E99 is negative infinity. The mean and standard deviation are by default 0 and 1, respectively, but can be edited.
4. Select the softkey PASTE by pressing d or f to calculate the normal probability.
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