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The mean height of 15 boys in a class is 162cm and the mean height of 10 girls is 152cm. Find the height of the 25 pupils.

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I assume you mean the average height of the 25 pupils. If so, it's just the sum of all their heights, divided by 25:
(15*162 + 10*152)/25

Thanks for you interest and I beg you please teacher me mathematics everyday

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