Make up five data points and show that Σ(X+C) = ΣX + NC, where C is any constant (e.g., 4) and N is the number of data points. i don't get it.
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$\displaystyle \sum_{i=1}^n(a_i +C)$ means $\displaystyle (a_1 +C)+(a_2 +C)+(a_3 +C)+(a_4 +C)+\cdots +(a_n +C) $ $\displaystyle = (a_1 +a_2+a_3+a_4 +\cdots +a_n)+(C+C+C+\cdots +C) $ $\displaystyle =\sum_{i=1}^n(a_i) +nC$
Originally Posted by matheagle $\displaystyle \sum_{i=1}^n(a_i +C)$ means $\displaystyle (a_1 +C)+(a_2 +C)+(a_3 +C)+(a_4 +C)+\cdots +(a_n +C) $ $\displaystyle = (a_1 +a_2+a_3+a_4 +\cdots +a_n)+(C+C+C+\cdots +C) $ $\displaystyle =\sum_{i=1}^n(a_i) +nC$ sorry, i still don't get what you mean.
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