Read a Dot Plot

Read a Dot Plot

A dot plot shows data values on a number line, with each dot representing one data point. When several dots are stacked above the same value, that value occurs more than once.

1) Read the scale first

Look at the numbers on the line and notice the spacing between them. Make sure you know what each marked value means before counting any dots.

2) Count the dots at each value

For each number on the axis, count how many dots are stacked above it. Each dot usually counts as one item in the data set.

3) Build the answer carefully

If the question asks for a frequency, report the number of dots at the requested value. If it asks for the total number of data points, add all the dots in the plot. If it asks for comparisons, compare the counts, not just the positions.

4) Simplify the final answer

Write the answer in its simplest form and use the exact value you counted. If the result is a total, make sure it is fully added.

Check your work

Scan the plot again and verify that every dot was counted once. A quick check is to total the dots by value and see whether the sum matches the number of data points shown.