The sum of differences between the group mean and the grand mean summed over all groups for a given set of observations is called variance.

The sum of differences between the group mean and the grand mean summed over all groups for a given set of observations is called the partitioning variance. This is used in the statistical tool ANOVA- between groups variance. It is abbreviated to SSB which means the sum of squares between groups. 

23×20+4×23

460+92

552 is the answers for the question

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