The probability of passing Professor Avila's math class is 65%, the probability of passing Professor Reid's biology class is 45%, and the probability of passing both is 25%. What is the probability of passing one or the other?
A)75%
B)85%
C)70%
D)110%

Question

Quizplus · Accepted Answer

We can use the formula P(A or B) = P(A) + P(B) - P(A and B), where A is passing Avila's class and B is passing Reid's class. Plugging in the given probabilities, we get P(passing one or the other) = 0.65 + 0.45 - 0.25 = 0.85, or 85%. Therefore, the best choice is B.

The Probability of Passing Professor Avila's Math Class Is 65