Bankrate.com, 20% of adults in the United States save nothing for retirement (CNBC website). Suppose that 15 adults in the United States are selected randomly. a. Is the selection of the 15 adults a binomial experiment? Explain. The selection - Select your answer - + ) a binomial experiment because the adults are selected ( - Select your answer - 4) , P - Select your answer = ) from trial to trial, the trials (- Select your answer - ) independent, and there are - Select your answer - + outcomes possible. b. What is the probability that all of the selected adults save nothing for retirement (to 4 decimals)? c. What is the probability that exactly five of the selected adults save nothing for retirement (to 4 decimals)? d. What is the probability that at least one of the selected adults saves nothing for retirement (to 4 decimals)