A boy was asked to find the arithmetic mean of the numbers 23, 17, 19, 25, 23, 18, 29, 27, 31 and P. He found the mean to be 24. What should be the number in place of P?

3

7

33

28

Clearly, we have (23+17+19+25+23+18+29+27+31+P/10) =24 Number in place of P is => 212+P = 240 => P= 240 -212 => P = 28.

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