A two-way table sorts data by two features at once, such as year group and favorite sport. Each row and column has a total, and the grand total is in the corner.
To fill in missing values, use the totals: a row's values add to the row total, and a column's values add to the column total. Two-way tables also give probabilities: if 8 of 44 students are Year 8 students who chose tennis, the probability of picking one at random is 8/44 = 2/11.
Worked example
A row has total 30. Two of its cells are 12 and 7. What is the third?
- The cells in a row add to the row total.
- 30 − 12 − 7 = 11.
Answer:11
Key words
- two-way table
- a table sorted by two categories
- row total
- the sum across a row
- grand total
- the total of everything
Practise this
New questions every time.
Common Core-referenced: 8.SP.A.4