According to a study, 70 % of adult smokers started smoking before 21 years old. 8 smokers
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Question:
According to a study, 70 % of adult smokers started smoking before 21 years old. 8 smokers 21 years old or older are randomly selected, and the number of smokers who started smoking before 21 is recorded.
1. The probability that at least 4 of them started smoking before 21 years of age is
2.The probability that at most 3 of them started smoking before 21 years of age is
3. The probability that exactly 6 of them started smoking before 21 years of age is
Q2.Suppose (24,40) is a 90% confidence interval estimate for a population mean μ.
Margin of error =?
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