Question

A drug trial is testing the effectiveness of two drugs. If 30 patients are given Drug A, 10 patients
are given Drug B, and 90 patients are given a placebo, what is the probability that a patient will not be given a placebo?

Answer 1

4/13

3/13

9/13

1/13

Answer 2

it was A

Answer 3

Total amount of people involved in the trial: 30+10+90=130
People not given Placebo 30+10=40
Probability given placebo is 40/130=4/13

Answer 4

thanks