Study the following table and answer the question that follows.
| School name | Total number of student enrolled | Percentage of students who opted for statistics |
| A | 450 | 20 |
| B | 200 | 18 |
| C | 500 | 12 |
| D | 400 | 15 |
What is the average number of students who opted for other than statistics subject in school A and D?
Answer & explanation
Correct answer: option 4
In A & D , Total number of students opted other than statistics
= 80% of 450 + 85% of 400
= \(\frac{4}{5}\) × 450 + \(\frac{17}{20}\) × 400
= 360 + 340
=700
Average = \(\frac{700}{2}\) = 350