SOLUTION: 40% of Country A are smokers, when the same moment 20% of Country B and 30% of Country C are smokers too. Also, it is given that people from Country A consist of 20% of the populat

Algebra.Com
Question 855527: 40% of Country A are smokers, when the same moment 20% of Country B and 30% of Country C are smokers too. Also, it is given that people from Country A consist of 20% of the population of all the tree countries(A,B,C) and that people from Country C consist of 50%.



a) A civilian is chosen randomly from the total population of all the three countries. What is the probability that he's smoker?

b) Granted that he's smoker, what is the probability that he comes from Country A?
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

	POP	smoker	% of total P

A	0.2	0.4	0.08

B	0.3	0.2	0.06

C	0.5	0.3	0.15

			0.29

P(smoker) = .2*.4 + .2*.3 + .3*50 = .08 + .06 + .15 = .29

P(A|smoker) = .08 

RELATED QUESTIONS


A medical researcher says that less than 24​% of adults in a certain country are... (answered by Boreal)

In a village, 48% of the people are men, 30% are smokers, and 60% are either men or... (answered by reviewermath)

At a local college, 10 of the male students are smokers and 490  are non-smokers. Of the... (answered by htmentor)

At a local college, 58 of the male students are smokers and 232 are non-smokers. Of the... (answered by ikleyn)

At a local college,  of the male students are smokers and   are non-smokers. Of the... (answered by richard1234)

At a local college,  of the male students are smokers and  are non-smokers. Of the female  (answered by Fombitz)

You are conducting a case-control study of smoking and lung cancer. If the probability of  (answered by ikleyn)

In a recent international sport​ competition, the top three countriesCountry ​A,... (answered by josgarithmetic,ikleyn)

The top three corn producers in the world​ - country​ A, country​ B,... (answered by josgarithmetic)