InvNorm on the TI83/84 allows us to find a value or zscore when given an area under the normal curve. The only trick is that the function always wants area to the left, so we often have to find that before using the calculator.

Note: This video is from a course I am teaching through my college but I share it in case others find it helpful! Any section numbers mentioned match up with the textbook "Business Statistics 8th edition Groebner".