medium · GMAT Quant
A healthcare administrator tracks length of stay (in days) across two outpatient clinics, Clinic A and Clinic B. Both clinics report an identical mean stay of 5.0 days. Clinic A treated 16 patients with a variance of 9.0, and Clinic B treated 24 patients with a variance of 4.0.
What is the combined population variance of stay durations across all 40 patients?
- 6.0
- 6.5
- 13.0
- 24.0
- 240.0
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