I am totally lost in how to do this. I am looking at my book and it's telling me to use the TI-84 and I follow the steps which it states (Press 2n,d VARS [2:nORMAL CDF(], then enter the two z scores seperated by a coma as in the (left z score, right z score). Only issue is I am given a single number and asked to find the area. Here is the copy.