Question
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 both telephones ring when the office is closed?
What is the probability that both telephones ring when the office is closed?
Answers
Both is an "and"
Multiply the two probabilities
.3 times .2
Multiply the two probabilities
.3 times .2
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