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?

Question

anonymous · Answer

A: 4/ 13
B: 3/13
C: 9/13
D: 1/13

anonymous · Answer

9/13 are given a placebo.
3/13 are given Drug A
1/13 are given Drug B
and 4/13 aren't given a placebo.

The question didn't seem too clear.

anonymous · Answer

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?

anonymous · Answer

Ok, so do you understand why that is the answer?

anonymous · Answer

ooohh yeah Ty

anonymous · Answer

np!

anonymous · Answer

Probability = Number of favorable outcomes/Total number of outcomes.

No. of favorable outcomes = 30 + 10 = 40
Total number of outcomes = 90+10+30 = 130

=> Probability = 40/1130 = 4/13.
So, we arrive at option (A).