A person with type A blood can donate red blood cells to people with type A or type AB blood. About 31% of the US population has type A blood. University High held a blood drive where 50 students donated blood. Part A: What is the probability that exactly 17 of the students had type A blood? (5 points) Part B: What is the probability that at least 17 of the students had type A blood? (5 points)