Reference no: EM132432529

1) In a tri-state conference, 60% attendees are from California, 25% from Oregon, and 15% from Washington. As it turns out 6 % of the attendees from California, 17% of the attendees from Oregon, and 12% 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 Washington?

2) The probability that a certain type of battery in a smoke alarm will last 3 years or more is .70. The probability that a 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?

3) Suppose that 6 out of 17 people are to be chosen to go on a mission trip. In how many ways can these 6 be chosen if the order in which they are chosen is not important.