A plant nursery is selling watermelon seeds as one of its products. It is known that 88% of all their watermelon seeds will germinate. Seeds are randomly packaged as sets of 20 seeds per a packet. a. A gardener purchased a packet of watermelon seeds. Find the probability that exactly 16 of the 20 seeds in the packet will germinate. b. Find the variance of the number of seeds in a packet of 20 that will germinate.