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Earlier discussion
3 older comments kept for context.
Abdulraheem Abdulqadir
The formular for variance is \Sigma f(x-x')/\Sigma f
Abdulraheem Abdulqadir
I made a mistake, that f(x-x') is f(x-x')^2
Doctor Strange
Variance = \(\frac{\sum f(x - \bar{x})}{\sum f}\)
= \(\frac{170.888}{46}\)
= 3.72