Question

Swimming Ability of Seventh and Eighth Graders
Can Swim Cannot Swim Totals
7th Graders 15 60
8th Graders 45
Totals 65 40 105
The table shows data for seventh and eighth graders who can and cannot swim. How would you construct the missing parts of the two-way table?

Answer 1

Fill in by using row and column totals.

- 7th graders: Can Swim = 60 − 15 = 45.
- 8th graders: Can Swim = 65 − 45 = 20.
- 8th graders Cannot Swim = 45 − 20 = 25 (or 40 − 15 = 25).

Completed table:
- 7th: Can Swim 45, Cannot Swim 15, Total 60
- 8th: Can Swim 20, Cannot Swim 25, Total 45
- Totals: Can Swim 65, Cannot Swim 40, Overall 105.