​ This table shows the times, in minutes, it took 40 sixth-grade students to run 1 mile. time (minutes)

frequency

4 to less than 6

1

6 to less than 8

5

8 to less than 10

13

10 to less than 12

12

12 to less than 14

7

14 to less than 16

2

Draw a histogram for the information in the table.

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)