(Solution Library) A graduate student wanted to do a study on drug abuse on a particular campus. It turned out that 1 in 5 people she approached refused
Question: A graduate student wanted to do a study on drug abuse on a particular campus. It turned out that 1 in 5 people she approached refused to answer any questions on the subject.
- If 15 people were approached and asked to answer questions, what is the probability that exactly 10 of them would answer the researcher's questions?
- In a sample of 10 people, what is the probability that at least one refuses to answer?
- In a sample of 20 people, how many would you expect to answer the graduate student's questions?
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