medium · GMAT Quant
A fintech firm tests transaction processing latency across two server regions with equal mean latencies. Region Alpha handles 400 transactions with a latency variance of 15 ms^2. Region Beta handles 100 transactions with a latency variance of 40 ms^2.
What is the combined variance of latency, in ms^2, for all 500 transactions?
- 27.5
- 35
- 20
- 55
- 10000
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