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 boys and show your workings!
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Answer:
8.68
Step-by-step explanation:
Mean= sum of all numbers/number of all terms
assume sum of all number as x
70/100= x/30 so 0.7=x/30 to get x you need to multiply 0.7 by 30 and x should come as 21
mean = 21/30 = 0.7
62% of 20 is 12.4
12.4 x 0.7 = 8.68
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