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 1099. (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 = -1099 without giving you a calculation error.
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