medium · GMAT Quant
A logistics warehouse tracks parcel delivery durations across two transport partners, Carrier 1 and Carrier 2. Carrier 1 delivered 12 shipments with a variance in delivery duration of 25 hours^2. Carrier 2 delivered 8 shipments with a variance in delivery duration of 40 hours^2. If the average delivery duration was identical for both carriers
What is the variance in delivery duration for all 20 shipments combined?
- 32.5 hours^2
- 31 hours^2
- 65 hours^2
- 25.8 hours^2
- 15.5 hours^2
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