mean using sigma notation. We write mean = 1 n n. ∑ i=1 xi . Exercises. 4. By ... (−1)kk. (c) (x1 − µ). 2 + (x2 − µ). 2 + (x3 − µ). 2 + (x4 − µ). 2 = 4. ∑.
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