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Class 10R sat a test. The mean mark of the class was 70%. There are 30 students in class 10R, 20 of...
5 months ago
Q:
Class 10R sat a test. The mean mark of 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.
Accepted Solution
A:
86%70X30=210020X62=12402100-1240 = 860860/10=86