The two blank spaces are filled with the numbers
Total of canoeing = 67.5
Intersection of total and total = 150
How to complete the table
The table is completed using the knowledge of frequency tables
This will be used to fill the blanks as follows:
Total of canoeing = intersections of canoeing (swimming and no swimming)
Total of canoeing = 28 + 39.5
Total of canoeing = 67.5
Intersection of total and total (column and row)
= 71 + 79
= 150