Statistics How To

Make a frequency chart and determine frequency

Main Index>Basic Graphs and Charts
> Make a Frequency Chart

Make a Frequency Chart: Overview

If you are asked to determine a frequency in statistics, it doesn’t just mean that you should just count out the number of times something happens. It usually involves you having to make a frequency chart to display a list of frequencies.

Make a Frequency Chart

A frequency chart.


A frequency is the number of times a data value occurs. For example, if ten students score 80 in statistics, then the score of 80 has a frequency of 10. Frequency is often represented by the letter f.
A frequency chart is made by arranging data values in ascending order of magnitude along with their frequencies.

Make a Frequency Chart: Steps

Step 1: Make a chart for your data. For this example, you’ve been given a list of twenty blood types for emergency surgery patients:

A, O, A, B, B, AB, B, B, O, A, O, O, O, AB, B, AB, AB, A, O, A.

On the horizontal axis, write “frequency (#)” and “percent (%)”. On the vertical axis, write your list of items. In this example, we have four distinct blood types: A, B, AB, and O.

making a frequency chart

Step 2: Count the number of times each item appears in your data.

In this example, we have:
A appears 5 times.
B appears 5 times.
O appears 6 times.
AB appears 4 times.

Write those in the “number” column (#). This is your frequency.

Step 3:
Use the formula % = (f / n) × 100 to fill in the next column. In this example, n = total amount of items in your data = 20. A appears
5 times (frequency in this formula is just the number of times the item appears). So we have:

(5 / 20) × 100 = 25%

Fill in the rest of the frequency column, changing the ‘f’ for each blood type.

statistics frequency chart

That’s it!

Check out our YouTube channel for elementary statistics!

Feel like cheating at statistics?