## How to Draw a Normal Distribution Curve on the TI-89

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 these types of problems. The TI-89 can graph a normal distribution with an area shaded for any value: less than a certain number, greater than a certain number, or in-between a certain set of numbers.

Sample problem: Draw a normal distribution curve for student’s salaries during a typical semester using a mean of \$6,800 and standard deviation of \$2,500. Shade the area that corresponds to salaries between \$7,300 and \$9,000.

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

Step 2: Press and .

Step 3: Press .

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 .

That’s it!

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

## 4 thoughts on “How to Draw a Normal Distribution Curve on the TI-89”

1. Steve

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.

2. Torason

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.

3. kenrosellc

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