The following two way table shows the data for the students of two different grades in a school.

based on the relative row frequency, the students of which grade or more likely to be members of the public library?

A. The students of both grades are equally likely to be members of the public library

B. No conclusion can be drawn about the chances of a student being a member of the public library

C. Grade 7

D. Grade 8

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)