$\displaystyle \Sigma (x_i+y_i)$ is equal to $\displaystyle \Sigma(x_i) + \Sigma(y_i)$ is equal to Xbar times n plus Ybar times n which is equal to n(Xbar+Ybar) where 'Xbar' and 'Ybar' are the sample average
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Hi! Yes, that's correct.
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