# How to Plot a Value on a TI-Nspire Histogram

On the TI-Nspire, you can plot a value on a histogram that displays as a vertical line perpendicular to the horizontal axis at a point equal to the specified value. In the third screen, press **[MENU]**→Analyze→Plot Value. At the prompt, type **mean(correct)** and press **[ENTER]**. (See the third screen.)

You can plot a single number or an expression that equals a number. Statistical values such as mean or standard deviation are good choices for Plot Value.

The Plot Value feature is also available with dot plots and box plots.

To remove a plotted value, move the cursor over the vertical line and press **[CTRL][MENU]**→Remove Plotted Value. To hide a normal curve, press **[MENU]**→Analyze→Hide Normal PDF.

Try hovering on the normal curve, right-clicking (**[CTRL][MENU]**), and choosing Shade Under Function. Shade a region under the curve by clicking the lower and upper bounds of the interval to display the corresponding probability associated with this interval.