hard · GMAT Quant
A logistics company evaluates route completion times across two regional hubs. Hub 1 has 16 drivers with mean time barx_1 = 40 minutes and sample variance s_1^2 = 8. Hub 2 has 24 drivers with mean time barx_2 = 50 minutes. If total sum of squares (mathrmSST) across all 40 drivers is 1310
What is the sample variance s_2^2 of completion times in Hub 2?
- 10
- 15
- 8
- 23
- 9.58
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