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. Press the softkey d or f to calculate the normal probability.
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