2. People with type O-negative blood are universal donors whose blood can safely be given to anyone. Only 15.2% of the population has O-negative blood. A mobile blood center is visited by 9 donors. Let X be the number in the 9 who are type O-negative blood. a. Calculate the probability that two of the 9 people have O-negative blood. (4 points) P(X=2) on ob beviser I be awo b. Calculate the probability that more than 2 of the 9 people have type O-negative blood. (4 points) wowod to aidh ann an bas ob 3. A physical fitness association is including the mile run in its secondary-school fitness test for boys. The time for this event for boys in secondary school is normally distributed with a mean of 440 seconds and a standard deviation of 50 seconds. If the association wants to designate the fastest 7% as "Excellent," what time should the association set for this criterion? (4 points)