SOLUTION: in a statistics examination, the mean mark of the first twelve students in a class is 60, that of the next twenty students is 50 and that of the remaining y students is x. What i
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Question 1138725: in a statistics examination, the mean mark of the first twelve students in a class is 60, that of the next twenty students is 50 and that of the remaining y students is x. What is the mean Mark for the whole class in the examination, in terms of x and y? Answer by rothauserc(4718) (Show Source):
You can put this solution on YOUR website! ((60 * 12) + (50 * 20) + xy) / (12 + 20 + y) =
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(720 + 1000 + xy) / (32 + y) =
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Mean Mark for the whole class is (1720 +xy)/(32 + y)
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