The average of 18 observations was calculated and it was 124. Later on it was d

Question

The average of 18 observations was calculated and it was 124. Later on it was discovered that two observations 46 and 82 were incorrect. The correct values are 64 and 28. The correct average of 18 observations is

Options:

A . 123

B . 137

C . 121

D . 122

Answer: Option D

Sum of 18 observations = 18x124 =2232
Correct sum of 18 observations = 2232-46-82+64+28
= 2196
Therefore, Correct average =2196/18 = 122.

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