7. Suppose that the percentage of American drivers who multitask (e.g., talk on cell phones, eat a snack, or text at the same time they are driving) is approxi- mately 85%. In a random sample of n : 15 drivers, let X equal the number of multitaskers. (a) How is X distributed? (b) Give the mean, variance, and standard deviation ofX (c) Find the probability that X is equal to 10 (d) Find the probability that X is greater than 10 (e) Find the probability that X is less than or equal to 10