Aptitude Question ID : 94158

If average of 20 observations x_{1}, x_{2}, ...., x_{20} is y, then the average of x_{1} - 101, x_{2} - 101, x_{3} - 101, ...., x_{20} - 101 is:
[A]101y
[B]20y
[C]y - 101
[D]y- 20

\mathbf{y - 101}
Required average =
= \frac{x_{1}+x_{2}+......+x_{20}}{20} - \frac{101\times 20}{20}
= y - 101
Hence option [C] is the right answer.

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