medium · GMAT Quant
A retail chain measures daily revenue per store across three regions. Region 1 consists of 10 stores with a mean daily revenue of $15 thousand; Region 2 consists of 15 stores with a mean daily revenue of $20 thousand; Region 3 consists of 25 stores with a mean daily revenue of $24 thousand. The sum of squared deviations within Region 1, Region 2, and Region 3 are 200, 350, and 450, respectively.
What is the total sum of squared deviations (mathrmSST) across all 50 stores?
- 1600
- 1000
- 600
- 400
- 2200
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