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Let $$x_{1}, x_{2} ... x_{n}$$ be a set of observations and $$f_{1}, f_{2} ... f_{n}$$ be their frequencies. If $$y_{i} = 3x_{i} + K$$ then $$\frac{\sum (y_{i} - \overline{y})^{2}f_{i}}{\sum f_{i}}$$
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