Question

p(a or b) indicates _______
choose the correct answer below
a. the probability that event a occurs in one trial followed by event b in another trial.
b. the probability that event a or event b does not occur in a single trial.
c. the probability that a and b both occur in the same trial.
d. the probability that in a single trial, event a occurs, event b occurs, or they both occur.

Explanation:

In probability theory, P(A or B) represents the probability of the union of two events A and B. This means the likelihood that either event A occurs, event B occurs, or both events occur in a single trial.

Answer:

D. the probability that in a single trial, event A occurs, event B occurs, or they both occur.