The TI-84 Plus is a graphing calculator made by Texas Instruments which was released in early 2004.

This calculator also helps you highlight specific areas of a graph, redraw graphs in certain ratios and even tweak graphs to suit your needs.

**Formula to calculate z-score in TI-84.**

- Press the ‘2ND’ button.
- Then press the ‘VARS’ button which is distribution
- Choose number three which is ‘invNorm’.
- Enter the number you want to find the z-score for and put the bracket.
- And lastly, press ‘ENTER’