- A67.5
- B65
- C70
- D62.5
Step-by-Step Solution
Total marks = . Boys' total = . Girls' total = 1800 - 990 = 810. Girls' mean = 810 / 12 = 67.5.
Answer: A) 67.5
In a class of 30 students in Chennai, the mean marks of all students is 60.
The mean marks of 18 boys is 55.
Find the mean marks of the 12 girls.
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