Events A and B are mutually exclusive, with P (A) = 0.65 and P (B) = 0.14.

What is P (A or B) ?

A.

0.091

B.

0.215

C.

0.51

D.

0.79

Answer: 0.79, D

Work:

The value of the probability of (A or B) when A and B are mutually exclusive is equal to P (A) + P (B). There is no need to subtract the P (A and B) because the events are mutually exclusive which means that they never overlap and P (A and B) is therefore equal to 0. The answer is then 0.65 + 0.14 which equals 0.79, which is the answer.