A survey of a group's viewing habits over the last year revealed the following information:
1. 28% watched gymnastics
2. 29% watched baseball
3. 19% watched soccer
4. 14% watched gymnastics and baseball
5. 12% watched baseball and soccer
6. 10% watched gymnastics and soccer
7. 8% watched all three sports
Calculate the percentage of the group that watched none of the three sports during last year.
The solution explains a probability problem.