If the mean of five observations x, x+2, x+4, x+6 and x+8 is 11 then the value of x is (a) 5 (b) ...

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If the mean of five observations x, x+2, x+4, x+6 and x+8 is 11 then the value of x is
(a) 5
(b) 6
(c) 7

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