The latest data from the CDC indicates that 14% of Americans are smokers. A researcher wants to identify smokers for a survey. He randomly selects people entering a grocery store to ask if they are a smoker. a) What is the probability that he identifies the first smoker on his 5th try? b) What is the probability that he has to approach more than 8 people before finding the first smoker? c) How many neople does be expect to anproach before finding the first smoker?

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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3. The latest data from the CDC indicates that 14% of Americans are smokers. A researcher
wants to identify smokers for a survey. He randomly selects people entering a grocery store
to ask if they are a smoker.
a) What is the probability that he identifies the first smoker on his 5th try?
b) What is the probability that he has to approach more than 8 people before finding the first
smoker?
c) How many people does he expect to approach before finding the first smoker?
Transcribed Image Text:3. The latest data from the CDC indicates that 14% of Americans are smokers. A researcher wants to identify smokers for a survey. He randomly selects people entering a grocery store to ask if they are a smoker. a) What is the probability that he identifies the first smoker on his 5th try? b) What is the probability that he has to approach more than 8 people before finding the first smoker? c) How many people does he expect to approach before finding the first smoker?
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