Question: On a TI-83 calculator, when do you use normalcdf and invNorm? I am trying to figure out the z-score with 0 as the mean and

On a TI-83 calculator, when do you use normalcdf and invNorm? I am trying to figure out the z-score with 0 as the mean and 1 as the standard deviation. This is in the context of percentages. For example, if the area is 15% to the left or 65% to the right. I don't really understand what it means. I want to use a calculator for the problem.

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