How to calculate percentages on a TI-89 for a normal probability distribution?

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To calculate percentages for a normal probability distribution on a TI-89, users can evaluate the integral of the normal distribution from a specified value to a higher limit, such as 100. For example, to find the percentage of data above a certain value in a distribution like N(80,5), this method can be applied. The standard functions on the TI-89 may not directly provide this percentage, so numerical evaluation is necessary. Users without the TI-89 Titanium may lack certain programs but can still perform these calculations. This approach simplifies the process compared to using tables.
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I have a ti-89, does anyone know how to calculate percentages of teh normal model on it? I am not sure what the function is, and using the table in the back of my book is a pain. The problem's I mean are, for example-
given N(80,5) what percentage of the data is above 92 given the information fits a normal probabilty distribution. note i don't have the 89 titanium so i may not have certain programs. Thank you
 
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I don't see a function for that immediately. You can always just ask it to numerically evaluate the integral of the normal distribution from whatever value you want to some high value like 100.
 
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