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The mean of 10 numbers is 12.5; among them the mean of the first 6 numbers is 15 and the mean of the…

Total of 10 numbers \(= 10 \times 12.5 = 125\). Sum of first 6 numbers \(= 6 \times 15 = 90\), and sum of last 5 numbers \(= 5 \times 10 = 50\). Therefore, the 6th number…

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The mean of 10 numbers is 12.5; among them the mean of the first 6 numbers is 15 and the mean of the last 5 numbers is 10, then which of the following will be the sixth number ?

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Correct answer B

Total of 10 numbers =10×12.5=125= 10 \times 12.5 = 125. Sum of first 6 numbers =6×15=90= 6 \times 15 = 90, and sum of last 5 numbers =5×10=50= 5 \times 10 = 50. Therefore, the 6th number =(90+50)−125=15= (90 + 50) - 125 = 15.

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