The Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean.

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15.6

14.6

answer is D.

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Detailed Solution

Given the mean of 20 observations is 17
Therefore the sum of the 20 observations = 17 x 20 = 340
New sum of 20 observations = 340 – 40 + 12 = 312
Hence, the new mean = $\frac{312}{20}$ = 15.6

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