The probability of observing at least one of two events [for example,p(A or B)] is ____.
A)p(A,B)- p(A)
B)p(A,B)- p(B)
C)p(A)p(B)
D)p(A)+ p(B)- p(A,B)

Question

Quizplus · Accepted Answer

The probability of observing at least one of two events can be calculated by adding the probabilities of the two events and then subtracting the probability of their intersection. This is represented by the formula: P(A or B) = P(A) + P(B) - P(A and B), which is given as option D.

The Probability of Observing at Least One of Two Events