If the mean of the set of numbers ${x_1}, {x_2}, {x_3}, ..., {x_n}$ is $\bar x$,then the mean of the numbers ${x_i} + 2i$,$1 \le i \le n$ is
- A$\bar x + 2n$
- B$\bar x + n + 1$
- C$\bar x + 2$
- D$\bar x + n$
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