Class 10r sat a test.
the mean mark for the class was 70%.
there are 30 students in class 10r, 20 of whom are boys.
the mean mark for the boys in the test was 62%.
work out the mean mark for the girls

86

Step-by-step explanation:

Given that there are 30 students in class 10R and the mean marks for the entire class was 70%. Therefore,

Given that there are 20 boys in the class and the mean marks for the boys was 62 %. Therefore,

To calculate the mean mark for the girls we need to find the total number of girl and total mark of girls.

if you mean

then it's c. 8, -7/3

but if you mean

then it is