Solution 34508: Computing the Z-Score on a TI-84 Plus C Silver Edition.
How do I compute the Z-score on TI-84 Plus C Silver Edition?
A Z-score is a value obtained when data from a symmetric distribution is standardized. The formula for determining the Z-score is:
Where x is the observation, m is the mean and s is standard deviation.
A standard observation is used to determine how many standard deviations the original observation falls from the mean. Z-scores can be looked up in a table (z-table) to find the area under the standard normal curve (or probability) to the left of the z-value.
On TI-84 Plus C Silver Edition, the area under the standard normal curve for a z-value of .1 can be found by entering the following:
• Press [2nd] [CATALOG] [S] and locate the ShadeNorm( command and press [ENTER].
• Press [(-)]   [,] [.]  [)].
• Press [ENTER].
The probability associated with a Z-score of .1 is shown in the bottom-left corner.
Please see the TI-84 Plus C Silver Edition guidebook for additional information.