According to a 2018 survey by 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-- a binomial experiment because the adults are selected --- Select p - Select --- from trial to trial , the trials are --- Select-- and there are outcomes possible .

( b ) What is the probability that all of the selected adults save nothing for retirement ? ( Round your answer to four decimal places )

( C ) What is the probability that exactly eight of the selected adults save nothing for retirement ? ( Round your answer to four decimal places . )

( d ) What is the probability that at least one of the selected adults saves nothing for retirement ? ( Round your answer to four decimal places )

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