SOLUTION: in physics examination the mean mark for the first 12 students is 60, that of the next 20 students is 50 and that of the remain y student is x. what is the mean mark for the whole
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Question 999055: in physics examination the mean mark for the first 12 students is 60, that of the next 20 students is 50 and that of the remain y student is x. what is the mean mark for the whole class in the exam in terms of x and y Answer by fractalier(6550) (Show Source):
You can put this solution on YOUR website! The mean in this case divides the total points by the total number of students.
Here the total points are 12(60) + 20(50) + y(x) = 1720 + xy
The total number of students is 12 + 20 + y = 32 + y
So that the mean is the quotient
