medium · GMAT Quant
A logistics company reviews delivery times across three routes with equal sample sizes of 10 drivers per route: Route A (mean 30 min), Route B (mean 40 min), and Route C (mean 50 min). The total sum of squares (mathrmSST) for all 30 drivers is 5,000. If Route A and Route B have within-group sums of squares of 900 and 1,100, respectively
What is the within-group sum of squares for Route C?
- 1,000
- 3,000
- 2,000
- 3,100
- 800
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