An aptitude test is believed to have 80% accuracy.Find the probability that the test will be accurate for at least one of the next two persons who take the test.
A) 0.92
B) 0.68
C) 0.84
D) 0.96
E) none of the above

Question

Quizplus · Accepted Answer

The probability that the test will be accurate for at least one of the next two persons who take the test is 1 - (probability that the test will not be accurate for either person). The probability that the test will not be accurate for either person is (1 - 0.8)^2 = 0.04. Therefore, the probability that the test will be accurate for at least one of the next two persons who take the test is 1 - 0.04 = 0.96.

An Aptitude Test Is Believed to Have 80% Accuracy