A person with type AB blood can donate red blood cells to people with the same blood type. About 12% of the US population has type AB blood. University High held
a blood drive where 50 students donated blood.

Part A: What is the probability that exactly 8 of the students had type AB blood? (5 points)

Part B: What is the probability that at least 8 of the students had type AB blood? (5 points)

Your vet has placed your pet on a diet. the diet is to contain at least 12 mg of fat and at least 14 mg of protein per serving. these requirements are to be obtained from two food sources. source a contains 2 mg of fat and 2 mg of protein per serving. source b contains 1 mg of fat and 3 mg of protein per serving. if source a sells for $1.28 per serving and source b sells for $1.12 per serving, how many servings of each type should be purchased to satisfy the requirements at minimal cost?