Qi Wang, Department of Statistics
Oct 4, 2017
A college student is running late for his class and does not have time to pack his backpack carefully. He has 12 folders on his desk, 4 include HW assignments due today. He grabs 3 of the folders randomly and when he gets to class, counts the number of them that contain HW.
Ron is doing his homework for Potions class and has lost his copy of Magical Drafts and Potions. Ron has forgotten whether to add mistletoe berries or juniper berries to his potion. Since Ron is in a hurry, he’s going to randomly pick one of these types of berries. The probability that he adds the mistletoe berries to his potion is 0.643. If he adds the mistletoe, the probability the potion works is 0.92. On the other hand, if he adds the juniper berries, the probability that the potion works is just 0.11