In a class of 40 students, 60% are girls. The average of the girl’s marks is 72 and that of the boys is 54. What are the average marks of the whole class?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 64.8
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Understanding |
Application |
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Given Total students = 40 Girls = 60% The average of the girl’s marks is 72 and that the boys is 54
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Number of girls in class = 40 × 60/100 = 24 Number of boys in class = 40 – 24 = 16 Average marks of girls = 72 Sum of marks of girls = 72 × 24 = 1728 Average marks of boys = 54 Sum of marks of boys = 54 × 16 = 864 Total sum of marks of all class = 1728 + 864 = 2592 Average marks of whole class = 2592/40 = 64.8 |