TI 89 statistics topic index > TI-89 Graph Normal Distribution Curve

## TI-89 Graph Normal Distribution Curve

The **TI-89 graphing calculator** can not only calculate **z-scores** and return values for normal distributions, it can graph the normal distribution curve as well. Graphing a normal distribution (a bell curve) can help you see what it is you are supposed to be looking for, and gives you one more tool in **solving normal distribution problems**. The TI-89 can graph a normal distribution curve with an area shaded for any value. For example, you could create a graph that is: less than a certain number, greater than a certain number, or in-between a certain set of numbers.

## TI-89 Graph Normal Distribution Curve: Steps

**Sample problem**: Draw a normal distribution curve for student salaries during a typical semester. The student salaries have a mean (average) of $6,800 and standard deviation of $2,500. Shade the area on the graph that corresponds to salaries between $7,300 and $9,000.

**Step 1:** Press Apps and select the **Stats/List Editor**.

**Step 2:** Press F2 3 and F2 4.

**Step 3:** Press F5 › 1.

**Step 4:** Scroll down and enter 7300 in the **lower value** box.

**Step 5:** Scroll down and enter 9000 in the **upper value** box.

**Step 6:** Scroll down and enter 6800 in the **μ** box.

**Step 7:** Scroll down and enter 2500 in the **σ** box.

**Step 8:** Scroll down. Turn **Auto Scale** to “yes” by pressing the right scroll key, then the down scroll key to select yes. Press Enter.

*That’s it!*

**Tip**: If you want to enter ∞ (infinity) as one of your lower or upper values, press the ♦ then Catalog.

Thank you so very much- my stats text was no help, the TI-89 book was no help and I’ve spent an hour online trying to figure out how to do this.

Outstanding.

Is it possible to go from at list, a set of results, and then get the Sigma and my, from the list?

I can only find out how to go the other way, but to find sigma and my, we need to draw and a stupid piece of paper, and i would like to advoid that, since it is alot harder to get it into your report.

Thanks.

Hi, Torason,

I’m unable to answer math questions here, but you can post in the forums –you should get an answer there.

Best,

Stephanie