medium · GMAT Quant
An e-commerce platform analyzes customer order amounts across two demographic segments. Segment 1 (30 customers) has a mean order amount of $80 and a within-segment sum of squared deviations of 4,500. Segment 2 (20 customers) has a mean order amount of $105 and a within-segment sum of squared deviations of 3,000.
What is the total sum of squares (mathrmSST) for the order amounts of all 50 customers?
- 15,000
- 7,500
- 10,750
- 8,125
- 22,500
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