What is the probability that the system is not empty?
A)0.60
B)0.40
C)0.83
D)0.17

Question

Quizplus · Accepted Answer

The probability of having at least one customer in the system is equal to one minus the probability of having no customers in the system. 
P(at least one customer) = 1 - P(no customers) = 1 - 0.20 = 0.80 
Therefore, the probability that the system is not empty is 0.80 or 0.83(rounded to two decimal places). The closest answer choice is C.

What Is the Probability That the System Is Not Empty