medium · GMAT Quant
An operations manager evaluates processing time variance across two regional distribution centers with equal average processing times. Warehouse 1 processed 15 orders with a within-group sum of squared deviations of 180 minutes^2. Warehouse 2 processed 35 orders with a variance of 8 minutes^2.
What is the combined variance, in minutes^2, across all 50 orders?
- 9.2
- 10.0
- 12.0
- 20.0
- 460.0
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