hard · GMAT Quant
An analytics manager evaluates performance scores across three regional support teams. Team A consists of 10 representatives with a mean score of 80 and a sample variance of 18. Team B consists of 15 representatives with a mean score of 90 and a sample variance of 24. Team C consists of 25 representatives with a mean score of 84 and a sample variance of 20.
What is the total sum of squared deviations (mathrmSST) about the combined grand mean for all 50 representatives?
- 1,628
- 978
- 650
- 1,690
- 1,029
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