Matermiddlehigh.enschool.org
Aug 12, 2015 · Weighted mean/ mean of data set whose entries have varying weights. ẋ = ∑ (x . w / ∑ w ), where w is the weight of each entry x. Mean of a frequency distribution for a sample is approximated by ẋ = ∑ (x . f / n ), where x and f are the midpoint and frequency of a class, respectively. Note n= ∑ f ................
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