If the probability of a number of people waiting is 0.10, the probability of one person waiting is 0.09, and the probability of two people waiting is 0.08, what is the probability of three or more people waiting?
A) 0.27
B) 0.73
C) 0.90
D) Cannot be determined

Question

Quizplus · Accepted Answer

To find the probability of three or more people waiting, we need to subtract the probabilities of no one, one person, and two people waiting from 1. 
Probability of no one waiting = 1 - (0.10 + 0.09 + 0.08) = 1 - 0.27 = 0.73
Therefore, the probability of three or more people waiting is 0.73. The correct answer is B.

If the Probability of a Number of People Waiting Is