Question

The mean of the three numbers is 12. If two of these numbers are 13 and 15. Then the third number is

Answer 1

Answer:

$let \: third \: no. \: be \: x \: \\ mean = \frac{sum \: of \: observations}{no. \: of \: observations} \\ 12 = \frac{x + 13 + 15}{3} \\ x + 28 = 36 \\ x = 8$

So third no. is 8.

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