area and associated probability

Assuming the normal temp for an adult it 98.20 with the standard deviation of 0.62 what is the probability of randomly selecting someone with a body temp above 99.90? I understand how to draw the sketch required by my instructor to work the problem, but I don't know what to do next.

If you are using the normal distribution, start by computing the z-score.

Yes, that much I know but I can't figure out how to use the z score chart which is one way we are required to do it. Then we have to do it with the calculator which I do not know the correct functions for. Does anyone have instructions on how to use either?