In a class, there are 29 boys and 21 girls. The average score of boys in Maths is 89, whereas the average score of girls in maths is 91. What is the average of the whole class in maths?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 89.84.
We know that,
Average = Sum of observations/Number of observations
Now,
Total score of boys = 29 × 89 = 2581
Total score of girls = 21 × 91 = 1911
Required average = (2581 + 1911)/50 = 89.84