In a class, the average age of 30 boys is 13 years and the average of 20 girls is 12 years. What is the average age of the whole class
- 12.5 yrs
- 14.2 yrs
- 12.3 yrs
- 12.6 yrs
- Explanation:
Total age of 50 students
(30×13+20×12) = 630
Average = 630/50 = 12.6 yrs