Mean height of students of a class is 168cms. If mean height of the boys is 170cms and the mean height of girls is 165cms, what is the proportion of boys in the class?
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Answer:
Average height of 30 boys is 150㎝
Total height =30×150
=4500㎝
One value is copied 135㎝ which was 165㎝
So, total =4500+165−135
=4530
So, correct mean =
30
4530
=151㎝
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