If $\bar{X}_1$ and $\bar{X}_2$ are the means of two series such that $\bar{X}_1 < \bar{X}_2$,and $\bar{X}$ is the combined mean of the two series,then which of the following is true?
- A$\bar{X} < \bar{X}_1$
- B$\bar{X} > \bar{X}_2$
- C$\bar{X}_1 < \bar{X} < \bar{X}_2$
- D$\bar{X} = \frac{\bar{X}_1 + \bar{X}_2}{2}$
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