A swimming club has 72 trainers who teach swimming and 30 of those trainers also teach diving. There are 28 trainers who do not teach swimming but teach diving and 8 trainers do not teach either swimming or diving. Which table best shows the relative frequency of rows for the data? (4 points)

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)