Find the mean of 25 no. , If the mean of 15 of them 18 and the mean of the remaining no. is 13 .
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Answer:
the correct answer will be 16
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Step-by-step explanation:
mean of first 15 no= 15*18=270
mean of next 10 no=10*13=130
mean of 25 no =(270+130)/25=400/25=16
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