compute the percentage of cases that lie below or to the left of the z score

/in /by

compute the percentage of cases that lie below or to the left of the z-score that is obtained when X = 50, sd = 10, and mean = 40.

Your answer must be in decimal form (e.g., .50)

Can this be put into a TI-84? If not please expalain the formula and process in detail