High School

Class 10R sat a test. The mean mark for the class was 70%. There are 30 students in 10R, of whom 20 are boys. The mean mark in the test for the boys was 62%.

What is the mean mark for the girls in the test?

Answer :

Final answer:

Calculating the total mark for all the students and subtract the total mark for the boys, will get 86%.

Explanation:

To find the mean mark for the girls in the test, we first need to calculate the total mark for all the students.

Since the mean mark for the class was 70% and there are 30 students, the total mark would be 70% x 30 = 2100%.

Next, we calculate the total mark for the boys, which is 62% x 20 = 1240%.

Finally, we subtract the total mark for the boys from the total mark for the class to find the total mark for the girls: 2100% - 1240% = 860%.

Finding the mean mark for the girls, we divide the total mark by the number of girls, which is 10.

Therefore, the mean mark for girls in the test is 860% ÷ 10 = 86%.

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