medium · GMAT Quant
A logistics firm measures delivery times across two division fleets. Fleet X contains 12 trucks with a mean delivery time of 40 minutes and a within-group sum of squared deviations of 650. Fleet Y contains 8 trucks with a mean delivery time of 50 minutes and a within-group sum of squared deviations of 450.
What is the total sum of squares (mathrmSST) for all 20 delivery times combined?
- 1,580
- 1,100
- 480
- 1,200
- 2,060
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