MATH 110 TEST 3- PORTAGE LEARNING

MATH 110 TEST 3- PORTAGE LEARNING In a tri-state conference, 20% attendees are from California, 45% from Oregon, and 35% from Washington. As it turns out 15 % of the attendees from California, 5 % of the attendees from Oregon, and 19% of the attendees from Washington came to the conference by train. If an attendee is selected at random and found to have arrived by train, what is the probability that the person is from Oregon? P(Train│C)=.15.. P(Train│O)=.05.. P(Train│W)=.19.. P(C)=.20,P(O)=.45,P(W)=.35. We want to find P(O│Train), so use: The probability that a certain type of battery in a smoke alarm will last 3 years or more is .70. The probability that the battery will last 6 years or more is .25. Suppose that the battery is 3 years old and is still working, what is the probability that the battery will last at least 6 years? Define E to be the event that the battery will last 3 years or more. Define F to be the event that the battery will last 6 years or more. We are given that: