SOLUTION: The mean of 10 boys in a class is 70% whereas all the mean marks of 15 girls is 60%. The mean mark of all the 25 students is

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Question 1080686: The mean of 10 boys in a class is 70% whereas all the mean marks of 15 girls is 60%. The mean mark of all the 25 students is
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
S0 then the total score for the boys is,
T%5Bb%5D=10%2A70=700
and for the girls,
T%5Bg%5D=15%2A60=900
So all together,
T=T%5Bb%5D%2BT%5Bg%5D
T=700%2B900
T=1600
Now divide by the total number of students,
mu=1600%2F%2810%2B15%29
Work that out for the answer.