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Answer :
Answer:
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,
- total mark of class = 70 x 30 = 2100
Given that there are 20 boys in the class and the mean marks for the boys was 62 %. Therefore,
- total mark of boys = 62 x 20 = 1240
To calculate the mean mark for the girls we need to find the total number of girl and total mark of girls.
- total number of girl = 30 - 20 (boys) = 10
- total mark of girls = total mark of class - total mark of boys = 2100 - 1240 = 860
- mean mark for girls = 860 / 10 = 86
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