If the mean of 4 observations is 20, when a constant 'c' is added to each observ

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If the mean of 4 observations is 20, when a constant 'c' is added to each observation, the mean becomes 22. The value of c is :

Options:

A . 6

B . $$ - $$ 2

C . 2

D . 4

Answer: Option C

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