medium · GMAT Quant
An analytics firm evaluates latency metrics across two data processing centers, Branch A and Branch B. Branch A contains 10 servers with a mean latency of 50 ms and a within-group sum of squared deviations of 400. Branch B contains 30 servers with a mean latency of 70 ms and a within-group sum of squared deviations of 1,200.
What is the total sum of squared deviations (mathrmSST) of all 40 servers about the combined grand mean?
- 1,600
- 3,000
- 3,850
- 4,600
- 6,100
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