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Mean of Two Groups
If two groups have sizes $$n_1,n_2$$ and means $$\bar{x}_1,\bar{x}_2$$:
$$\bar{x}=\frac{n_1\bar{x}_1+n_2\bar{x}_2}{n_1+n_2}$$
Usage
- Used to find the mean of combined datasets.
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Mean of Two Groups
If two groups have sizes $$n_1,n_2$$ and means $$\bar{x}_1,\bar{x}_2$$:
$$\bar{x}=\frac{n_1\bar{x}_1+n_2\bar{x}_2}{n_1+n_2}$$
Usage
- Used to find the mean of combined datasets.
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