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10. The average weight of a polar bear is 1.20O pounds, the average weight of a brown bear is 800 pounds, and the average weight of a black bear is 400 pounds. How many times greater is the average weight of a polar bear than that of a black bear? 1,200-400 = 8000

How many times greater is the average weight of a brown bear than that of a black bear?

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)