Discussion
Consider the percentage of students of different schools involved in various activities.
| School→ Activities↓ | SS | BS | CS | DS |
|---|---|---|---|---|
| Games | 25 | 30 | 20 | 23 |
| Music | 15 | 25 | 25 | 20 |
| Academic | 30 | 20 | 25 | 15 |
| Dance | 25 | 15 | 22 | 30 |
The difference in average number of students in various activities of CS and the average number of students in dance is ________.
Answer: A
The difference is 0. For CS, the average over the four activities is (20 + 25 + 25 + 22) / 4 = 92 / 4 = 23. For dance, the average over the four schools is (25 + 15 + 22 + 30) / 4 = 92 / 4 = 23. The difference is 23 - 23 = 0.
2, 3 and 5 would result only from misreading a cell in the table.
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