A particular flu vaccine is effective for 90 percent of the patients who receive it. What is the probability that it will be effective for both of the next two randomly selected patients?
A) 0.54
B) 0.63
C) 0.72
D) 0.81
E) 0.90

Question

Quizplus · Accepted Answer

The probability that the vaccine is effective for both patients is the product of the individual probabilities: 0.9 * 0.9 = 0.81.

A Particular Flu Vaccine Is Effective for 90 Percent of the Patients