Mathematics · important
Combined mean of two groups for JEE
Measures of dispersion; calculation of mean, median, mode of grouped and ungrouped data
Formula
\(\bar{x}=\frac{n_1\bar{x}_1+n_2\bar{x}_2}{n_1+n_2}\)
Variables: \(n_1,n_2\): sizes of groups, \(\bar{x}_1,\bar{x}_2\): their means.
Conditions: For combining two data sets.
Mixture/combined data problems.