medium · GMAT Quant
A retail chain analyzes store revenue across three sales divisions. Division 1 (20 stores) has a mean revenue gap of $2 thousand above the overall mean, Division 2 (30 stores) has a mean gap of $3 thousand below the overall mean, and Division 3 (50 stores) has a mean gap of $1 thousand above the overall mean. If within-group sum of squares (mathrmSSW) across all stores is 450
What is the total sum of squares (mathrmSST)?
- 50
- 464
- 850
- 1,250
- 400
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