How to Make a Histogram on TI-84 (Step-by-Step)

Quick answer: To learn how to make a histogram on TI-84, enter your data in a list (STAT → EDIT), then press 2ND → Y= (STAT PLOT), turn on Plot1, select the histogram icon, set Xlist to your data list, choose ZoomStat with ZOOM → 9, and adjust Xscl in WINDOW to change bin width.

# How to Make a Histogram on TI-84 (Step-by-Step)

A histogram is the go-to graph for showing the distribution of numerical data — test scores, heights, reaction times, anything measured in numbers. On the TI-84 Plus CE, making one takes about a minute once you know the button sequence: enter your data into a list, turn on STAT PLOT, pick the histogram type, and let ZoomStat do the framing.

This guide shows you how to make a histogram on TI-84 with exact key presses, how to control bar width, and how to avoid the mistakes that leave students staring at a blank screen. If you’re in AP Statistics, this is one of the most-used TI-84 skills in the course — right up there with normalcdf and t-tests.

No physical calculator handy? Every step below works identically on a free TI-84 calculator online.

What You Need Before You Start

• Your data values (the raw numbers, not a summary)
• A cleared list to put them in — we’ll use L1
• Any old functions in Y= turned off or cleared, so they don’t draw over your histogram

Step 1: Enter Your Data into a List

1. Press STAT, then 1:Edit… and press ENTER. You should see columns labeled L1, L2, L3.
2. If L1 already has old data, highlight L1 at the top, press CLEAR, then ENTER. (Pressing DEL only deletes one value — CLEAR wipes the whole list.)
3. Move the cursor into the first empty row under L1 and type your first value, then press ENTER. Repeat for every data value.

Example data (quiz scores out of 100): 72, 81, 65, 90, 77, 83, 88, 70, 79, 85, 92, 68, 74, 80, 86.

Step 2: Turn Off Anything That Could Interfere

Two things commonly ruin histograms: leftover functions and other stat plots.

1. Press Y= and make sure every function line (Y1, Y2, …) is empty. If anything is there, highlight it and press CLEAR.
2. Press 2ND, then STAT PLOT (the Y= key). If Plot2 or Plot3 shows On, select it and turn it Off. We’ll set up Plot1 ourselves in the next step.

Step 3: Set Up STAT PLOT for a Histogram

1. Press 2ND, then STAT PLOT.
2. Select 1:Plot1… and press ENTER.
3. Highlight On and press ENTER.
4. Move down to Type. You’ll see six little icons. Select the third one — the histogram icon (it looks like bars). Press ENTER.
5. Set Xlist to L1: highlight Xlist, press 2ND, then 1 (L1 is above the 1 key), and press ENTER.
6. Set Freq to 1 (this means each value counts once). Type 1 and press ENTER.

Your Plot1 screen should now read: On, histogram type selected, Xlist:L1, Freq:1.

Step 4: Graph It with ZoomStat

Press ZOOM, then 9:ZoomStat, and press ENTER.

ZoomStat automatically picks a window that fits your data — the calculator looks at the smallest and largest values in L1 and frames the histogram for you. You should now see bars on the screen. If the screen is blank, don’t panic — jump to the troubleshooting section below.

Step 5: Control the Bar Width with Xscl

The default bar width ZoomStat picks is sometimes ugly — bars too skinny or one giant blob. You control bar width with Xscl (x-scale) in the WINDOW menu.

1. Press WINDOW.
2. Find Xscl and type the class width you want. For quiz scores out of 100, Xscl=5 gives bars like 65–70, 70–75, 75–80, and so on. Xscl=10 gives wider bars: 60–70, 70–80, 80–90.
3. Make sure Xmin is at or below your smallest value and Xmax is above your largest value.
4. Press GRAPH to redraw.

Smaller Xscl = more detail but choppier shape. Larger Xscl = smoother shape but less detail. For AP Statistics, pick a width that shows the shape clearly without hiding gaps or clusters.

Step 6: Read Bar Frequencies with TRACE

1. Press TRACE. A blinking cursor lands on the first bar.
2. Use the left and right arrow keys to move from bar to bar.
3. At the bottom of the screen you’ll see something like min=70< x <75 and n=4 — meaning 4 data values fall in the 70–75 class.

This is how you answer “how many students scored between 70 and 75?” straight from the graph.

Fixing Common Histogram Problems

Blank screen after ZoomStat? The usual suspects: Plot1 isn’t actually On, a function in Y= is interfering, or you selected the wrong plot type (the connected-line icon instead of the histogram icon). Go back through Steps 2 and 3 carefully. For a deeper walkthrough of blank-graph causes, see TI-84 graph not showing fix.

One giant blob instead of bars? Your Xscl is too large relative to the data spread, or Xmin/Xmax are way off. Set Xscl to a sensible class width as described in Step 5.

“ERR: DIM MISMATCH”? This happens when the Freq list has a different number of entries than Xlist. If you’re not using a frequency list, make sure Freq is set to 1, not to another list.

Bars look like a connected line, not separate bars? You picked the xyLine or another plot type instead of the histogram icon in Step 3. Reopen STAT PLOT and select the third icon.

“ERR: STAT”? ZoomStat throws this when the list is empty or has only one distinct value. Check that L1 actually contains your data.

Histogram vs Bar Graph: Don’t Mix Them Up

A histogram shows the distribution of numerical data, and its bars touch because the classes are continuous ranges (70–75, 75–80). A bar graph shows categories (favorite colors, car brands) with gaps between bars. The TI-84’s STAT PLOT histogram is for numerical data only. Once you know how to make a histogram on TI-84, remember: if your data is categorical, a histogram is the wrong graph, and your AP Stats teacher will mark it wrong.

Describing Histograms for AP Statistics

On the AP exam, knowing how to make a histogram on TI-84 is only half the job — you also have to describe it. Use SOCS:

• Shape — symmetric, skewed left, skewed right, uniform, bimodal?
• Outliers — any bars separated from the rest?
• Center — roughly where’s the middle? (You can get the exact mean/median with STAT → CALC → 1:1-Var Stats.)
• Spread — range of the data, from lowest to highest class.

Context matters too: “The distribution of quiz scores is roughly symmetric with no outliers, centered around 80.” That one sentence, backed by your TI-84 histogram, is what earns full credit.

FAQ

How to Make a Histogram on TI-84 from a Frequency Table?

Enter the data values in L1 and their frequencies in L2 (STAT → Edit). In STAT PLOT setup, set Xlist to L1 and Freq to L2 instead of 1. Then use ZOOM → 9:ZoomStat as usual. The calculator will weight each value by its frequency.

Why is my TI-84 histogram blank?

When learning how to make a histogram on TI-84, a blank screen is almost always one of three things: Plot1 is not turned On, there’s a leftover function in Y= drawing over it, or you selected the wrong plot type icon. Re-check STAT PLOT settings and clear Y=, then press ZOOM → 9:ZoomStat again.

How do I change the bar width on a TI-84 histogram?

Press WINDOW and change Xscl — that’s the class width. Students learning how to make a histogram on TI-84 should try Xscl=5 and Xscl=10 to see the difference: smaller Xscl gives narrower, more numerous bars; larger Xscl gives wider, fewer bars. Adjust Xmin and Xmax to frame your data, then press GRAPH.

Can the TI-84 calculate the mean and median from histogram data?

Not from the graph itself, but from the same list: press STAT → CALC → 1:1-Var Stats, set List to L1, and press ENTER (twice on some models). You’ll get the mean (x̄), median (Med), standard deviation, min, and max.

What’s the difference between a histogram and a boxplot on the TI-84?

Both live in the STAT PLOT Type menu — the histogram is the third icon (bars), and boxplots are the later icons. Histograms show the full shape of the distribution; boxplots summarize it with quartiles. For AP Stats, know how to make both from the same list.