If the probability of a certain event is .50 and the probability of a second event is .50, what is the probability of having the first event occur OR the second event occur?
A) .25
B) .50
C) .75
D) 1.00

Question

Quizplus · Accepted Answer

The probability of having the first event occur OR the second event occur is the sum of the probabilities of each event occurring, minus the probability of both events occurring. In this case, the probability of both events occurring is 0, so the probability of having the first event occur OR the second event occur is .50 + .50 = 1.00.

If the Probability of a Certain Event Is