Forty percent of the customers who go to ABC Tires for tires buy four tires and 34% buy two tires. Moreover, 20% buy fewer than two tires, with 5% buying none. a. What is the probability that a customer buys three tires? (Round your answer to 2 decimal places.) b. Construct a cumulative probability distribution for the number of tires bought. (Round your answers to 2 decimal places.)