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A drug trial is testing the effectiveness of two drugs, If 50 patients are given Drug A, 20 patients are given Drug B, and 100 patients are given a placebo, what is the probability that a patient will NOT be given a placebo?

a. 10/17
b. 7/17
c. 5/17
d. 2/17
I saw there was a problem like this and it said to add up all the patients and then put the number of patients of B over the total and simplify and I did this and got 2/17 and got it wrong, I have one more attempt to do.

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Lindsey

  1. 70 patients are given a drug ... either A or B

    100 patients are given a placebo

    70 out of 170 (total) are not given a placebo ... 70 / 170

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    R_scott

  2. 7/17

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    Anonymous

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