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Class Mark
The class mark or midpoint of a class interval $$[a,b)$$ is:
$$x_i=\frac{a+b}{2}$$
Usage
- Used as the representative value of a class while calculating mean and variance of grouped data.
The class mark or midpoint of a class interval $$[a,b)$$ is:
$$x_i=\frac{a+b}{2}$$
Usage
- Used as the representative value of a class while calculating mean and variance of grouped data.
