Probability and Statistics > TI 89 for Statistics > TI 89 Histogram

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**histogram**, or frequency distribution, is a type of graph that has bars representing data. Each bar represents a certain amount of data. Once you have input the data for the TI 89 histogram and graphed it, the TI-89 will even count how many items are in each bar (or class).

## TI 89 Histogram: Steps

Watch the video or read the steps below:

**Sample problem:** Create a histogram for the following new car costs: 12,500; 22,400; 14,300; 32,200; 21,500; 19,980; 15,001; 22,001; 32,036; 35,124; 29,001; 25,006; 27,001; and 18,500.

**Step 1:** Press APPS and scroll to the Stats/List Editor. Press ENTER.

**Step 2:** Press F1 then 8 to clear the list editor of data.

**Step 3:** Enter “cars” as the list name by pressing 2nd ALPHA )=23 ENTER.

**Step 4:** Enter your data:

12500 ENTER

22400 ENTER

14300 ENTER

32200 ENTER

21500 ENTER

19980 ENTER

15001 ENTER

22001 ENTER

32036 ENTER

35124 ENTER

29001 ENTER

25006 ENTER

27001 ENTER

18500 ENTER

**Step 5:** Press F2 ENTER and F1 to go into Plot Setup (Define Plot).

**Step 6:** Press the right scroll arrow to bring up a menu for Plot Type. Press 4 for **Histogram**.

**Step 7:** Scroll down to “**x**” Press 2nd – (the minus key) to bring up **Var-Link**. Scroll down to “cars” and press ENTER.

**Step 8:** Scroll down to **Hist. Bucket Width** and enter 5000 ENTER. This is your class width.

**Step 9:** Press ENTER F5. *Note*: If you press ENTER too many times and end up at the home screen, just press the diamond key and then F3 (for graph).

**Step 10:** Press 3 for the trace function. Use the left and right scroll keys to move from one bar to another. (This will tell you how many items are in each class (n = x)).

**Tip #1**: If your TI 89 histogram doesn’t show (or only part of the graph shows), you may need to change the window. Press the **diamond key** then F2 to check your window settings. For the above graph, your settings should be approximately 10000 < x < 40000 and 0 < y < 8. Set the xscl and yscl to 1. Press F2 then 9 to return to the graph.

**Tip #2**: Make sure the alpha lock is turned on by checking for a little black box with “a” in it on the bottom left of your screen.

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