Two-way tables

You can use a two-way table to show two sets of information.

Exercise in two-way tables

Aled carried out a survey to see how many of his classmates are left-handed. His results are shown in the table below:

Two way table

This is an example of a two-way table and it is used to show two different features in a survey.

In this case it shows:

  • boys and girls
  • left-handed or right-handed

You can find out lots of information from this table. For example, you can see that there are \({2}\) left-handed boys in the class. You can also see that there are \({13}\) girls in the class (\({1}\) left-handed and \({12}\) right-handed).

Question

Q1. How many right-handed children are there in the class?

Q2. How many children are there in total?

A1. There are \({14}\) right-handed boys and \({12}\) right-handed girls, so \(14 + 12 = 26\) in total.

A2. There are \({29}\) children in total.

This is the total of all the numbers in the table.