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According to a study, 90 % of adult smokers started smoking before 21 years old. 10 smokers 21 years old or older are randomly selected, and the number of smokers who started smoking before 21 is recorded.Find:


1. The probability that at least 3 of them started smoking before 21 years of age.
2. The probability that exactly 3 of them started smoking before 21 years of age.

 Oct 13, 2020

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 #1
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I will not give you the direct answer but will give you a starting step.

 Oct 14, 2020
edited by Guest  Oct 14, 2020
 #2
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90% before 21 

but 10 people are selected so it would be 90% of 10 * 0.3

and for the second it should be pretty easy if you figure out the first

 Oct 14, 2020

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