hard · GMAT Quantitative Reasoning
Plant North has 4 defect counts with mean 8 and standard deviation 2. Plant South has 6 defect counts with mean 10 and standard deviation 4.
Treating each standard deviation as the population root-mean-square deviation from its group mean, what is the combined population standard deviation of all 10 observations?
- 35.42
- 2.00
- 3.20
- 3.49
- 3.00
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