medium · GMAT Quant
An operations analyst evaluates the call duration variance across two customer support teams. Team Alpha handles 10 calls with a duration variance of 16 minutes^2. Team Beta handles 30 calls with a duration variance of 36 minutes^2. If both teams share the exact same mean call duration
What is the combined duration variance across all 40 calls?
- 31 minutes^2
- 26 minutes^2
- 52 minutes^2
- 1,240 minutes^2
- 21 minutes^2
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