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How to find the Mean of a Bar Graph

In a previous post we showed you how to work out the mode of a bar chart, also called a bar graph. This time, we’ll look at how to work out the mean of a bar chart.


Let’s use the same example. A group of students were surveyed on what pets their families had. Here are the results:

Statistics for a bar graph
 Survey results show in bar graph


Show in a bar graph, the results look like this:

Bar graph
 

What is the mean of a bar graph?


The mean is also called the average. To find the mean, we’ll need to:


1.    Add all the numbers.

The numbers in this example are 2, 5, 3, 4, 1


2.    Divide the sum by the number of addends.

The number of addends in this example are 5.


Here’s how to work out the mean of our example:


2 + 5 + 3 + 4 + 1 = 15


15 / 5 = 3


The mean number of pets is 3.