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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?
- A11.8 Years
- B12.2 Years
- C12.4 Years
- D12.6 Years
Correct answer: D
Discussion 1
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CCommunity
12.6 Years
Total age of 50 students
(30X 13+20 X 12) = 630
Average = 630/50 = 12.6 Years
Total age of 50 students
(30X 13+20 X 12) = 630
Average = 630/50 = 12.6 Years