The prevalence of osteoarthritis in the elderly among high-risk populations is approximately 6.3%. Suppose that a mobile health clinic is used to identify subjects with this condition for a clinical study with an alternative treatment. If 500 people from this population are evaluated in the clinic in a single day, what is the probability of identifying 20 CASES OR LESS of osteoarthritis? A. 0.8708 B. 0.9861 C. 0.0212 D. 31.5 E. 29.5

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