hard · GMAT Quant
A healthcare operations analyst audits emergency room wait times in minutes across three regional clinics. Clinic 1 (10 patients) has mean wait time barx_1 = 30 minutes and sample variance s_1^2 = 5. Clinic 2 (10 patients) has mean wait time barx_2 = 40 minutes and sample variance s_2^2 = 8. Clinic 3 (20 patients) has mean wait time barx_3 = 25 minutes and sample variance s_3^2 = 6.
What is total sum of squares (mathrmSST) across all 40 patient observations?
- 1731
- 231
- 1500
- 1761
- 254
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