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 is a binomial experiment because the adults are selected randomly. ,p does not change from trial to trial, the trials are independent , 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 exactlysixof the selected adults save nothing for retirement? (Round your answer to four decimal places.)

https://www.webassign.net/aswsbe13/appendix-b.pdf

https://www.webassign.net/tparise/beta/stats/distributionIndex.html