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WB JEE 2017
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Mean of n observations x1, x2, ...., xn is $$\overline x $$. If an observation xq is replaced by xq' then the new mean is
A
$$\overline x - {x_q} + {x_9}'$$
B
$${{(n - 1)\overline x + {x_q}'} \over n}$$
C
$${{(n - 1)\overline x - {x_q}'} \over n}$$
D
$${{n\overline x - {x_q} + {x_q}'} \over n}$$
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