The mean of twenty observations x(1),x(2...

The mean of twenty observations `x_(1),x_(2),x_(3),x_(4), . . . .x_(20)` is m. If each of the first ten observations is decreased by 8, then the new mean is n. The difference `m-n` equals

A

16

B

20

C

4

D

8

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The correct Answer is:

C

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