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Average
Arithmetic mean
Variance
Key terms: math mean bar weighted sum frac sigma class sample data variance case mu value weighted mean mathbf average chi students equal decrease observations zero sqrt dots step variable expected error strength choice standard deviation account unbiased class means exponential estimator tail area unweighted properties arithmetic combination sample variance weighted sample mean normalized weights weighted average straight average average student grade students in each class number of students in each Search external links cited by footnotes on Wikipedia page Weighted mean: |
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