na traction. UCcasional smoker. Write you answer with three That the person is a

Question

na traction. UCcasional smoker. Write you answer with three That the person is a women or regular smoker. Write you answer with three decimal places and fraction. That the person is a men and regular smoker. Write you answer with three decimal places and fraction. That the person is a men or ocasinal smoker. Write you answer with three decimal places and fraction. e) 9, A ccording to the Statistical Abstract of the United States, about 29% of the 18-to 25-years- old are current marijuana users. Find the following probabilities. Write your answer with three decimal places and percent with onse decimal place a) What is the probability that four randomly selected 18- to 25-year-olds are all marijuana users? b) What is the probability that four randomly selected 18-to 23-year-old t least oneisa marijuana users? nur answer lators is randomly selected from a group containing 17 that are

Explanation / Answer

Given:

Percentage of marijuana users in the age group of 18 to 25 years = 29%

Hence, the probability, p = 0.29

a)

Probability that 4 randomly selected and all are marijuana users will be calculated as 0.29*0.29*0.29*0.29 = 0.007

Percent = 0.7%

b)

Atleast one is marijuana user:

Probability of atleast one is marijuana user can be calculated as 1 - Probability that none of the 4 selected is marijuana user.

Probability that none of the 4 selected are marijuana user is calculated as (1-0.29)*(1-0.29)*(1-0.29)*(1-0.29) = 0.71*0.71*0.71*0.71 = 0.2541

Hence, the Probability that atleast one is marijuana user= 1 - 0.2541 = 0.7459.

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