The TI-84's Statistics functions are notoriously difficult to figure out. Fortunately, Dr. Claude Moore at Cape Fear Community College has published step-by-step instructions for each function.

This is what her explanation looks like for the normalcdf function.

WARNING: Some versions of the TI-84 have calculation errors if you enter extreme values for z, such as 10

^{99}. (The answer that pops out of normalcdf might be off by as much as 0.5!) It might be tempting to do this in order to capture every bit of area under the bell curve, but for all practical purposes, z = -1000 will work just as well as z = -10^{99}without giving you a calculation error.
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