That neither ring
Probability that A does not ring is .7
Probability that B does not ring is .8
Multiply the two.
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 neither telephone rings when the office is closed
2 answers
If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.