I am assuming that A rings when the office is open.
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.
(1-.30)(.20) = ?
Assume an office has two telephones (A and B) with separate lines and different telephone numbers. The probability that telephone A rings when the office is closed is .30. The probability that telephone B rings when the office is closed is .20
What is the probability that A rings given that B rings when the office is closed?
1 answer