The average income of individuals in one group is $\bar{x}$ and the average income of another group is $\bar{y}$. If the ratio of the number of individuals in both groups is $4:3$,what is the average income of the combined group?
- A$\frac{\bar{x} + \bar{y}}{7}$
- B$\frac{3\bar{x} + 4\bar{y}}{7}$
- C$\frac{4\bar{x} + 3\bar{y}}{7}$
- DNone of these
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