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Two-way tables can be used to display information relating to several different options and categories.

The following table shows the numbers of right and left-handed children in a school year group of 70 children.


  Boys Girls Total
Right 24 32 56
Left 4 10 14
Total 28 42 70


Notice how the totals add up in both directions.

There are 56 right-handed children.

There are 32 right-handed girls.

The probability that a child chosen at random is a right handed girl is 32/70 = 16/35


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