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You may need to use the appropriate appendix table or technology to answer this question. According...

You may need to use the appropriate appendix table or technology to answer this question.

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 or is not ----- a binomial experiment because the adults are selected  ------ by choice or randomly -----, p  --- changes or does not change ----- from trial to trial, the trials are  ----- independent or not 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 exactly six 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.)

math   Statistics-And-Probability   
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