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Combine mean calculated by different given mean is ________?

/ Measures Of Location, Statistics Mcqs / By
Combine mean calculated by different given mean is ________?

A. n1x1 + n2x2x + _____ nuxu/n1 +n2 + ___ + nu
B. n1x1 + n2x2x + _____ nuxu/x1 + x2 + ____ x4
C. n1x1 + n2x2x + _____ nuxu/n1 + n2 + ___+ nu
D. ∑n1x/x1