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$$ \chi^2 = \sum_{i=1}^N
          \left(y_i - (a + b x_i)
	  \over \sigma_i\right)^2 $$
		    

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tex \TeX 
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$$-- f(x) = {1 \over \sigma \sqrt{2\pi}}e@sup{-{1 \over 2}\left({x-\mu \over \sigma}\right)^2}
$$
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