Approximately 25% of the calls to an airline reservation phone line result in a reservation being made.
(a) Suppose that an operator handles 15 calls. What is the probability that none of the 15 calls result in a reservation?

Question

Approximately 25% of the calls to an airline reservation phone line result in a reservation being made.
(a) Suppose that an operator handles 15 calls. What is the probability that none of the 15 calls result in a reservation?

kropot72 · Answer

The probability of a reservation not being made on a call is 1.00 - 0.25.
The probability that none of the 15 calls result in a reservation is given by:
$$\large (1.00-0.25)^{15}=you\ can\ calculate$$