In a class of 45 students, 40% are girls and the remaining are boys. The average marks of the girls is 64 and that of the boys is 60. What is the average marks of the whole class?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 61.6
No. of girls = 45 × 40/100 = 18
So,
No. of boys = 45 - 18 = 27
Total mark of girls = 64 × 18 = 1152
Total mark of boys = 60 × 27 = 1620
Hence,
Total mark of the class = 1152 + 1620 = 2772
Average marks of the whole class = 2772/45 = 61.6