Question 3: (4 pts) If you have O-negative blood, your blood can be given to any person (universal donor). Suppose that the probability that a random person is O-negative is one in ten (in truth it is slightly less than this). Suppose that four donors in a row enter a blood donor center, and they enter randomly. (a) (2 pts) What is the chance that all four donors are O-negative? (b) (2 pts) What is the chance that at least one is