Question: Repairs, again. You used the Multiplication Rule to calculate repair probabilities for your cars in Exercise I.
a) What must be true about your cars in order to make that approach valid?
b) Do you think this assumption is reasonable? Explain.
Exercise I: More repairs. Consider again the auto repair rates described in Exercise II. If you own two cars, what is the probability that
a) neither will need repair?
b) both will need repair?
c) at least one car will need repair?
Exercise II: Car repairs. A consumer organization estimates that over a 1-year period 17% of cars will need to be repaired once, 7% will need repairs twice, and 4% will require three or more repairs. What is the probability that a car chosen at random will need
a) no repairs?
b) no more than one repair?
c) some repairs?