Yes No Total We are given the two-way table:

Children 0.3 0.4 0.7

Adults 0.25 x 0.3

Total 0.55 0.45 1

0.25+x=0.3

We can determine x either on its column, or on its row: the last element in the column/row is the sum of the previous elements:

x=0.3-0.25

x=0.05 We determine x:

Children 0.3 0.4 0.7

Adults 0.25 x 0.3

Total 0.55 0.45 1

0.25+x=0.3

We can determine x either on its column, or on its row: the last element in the column/row is the sum of the previous elements:

x=0.3-0.25

x=0.05 We determine x: