Problem 5
A survey was taken of 100 randomly selected individuals and each was asked if they smoke. Of the 60 men who where surveyed 19 said they smoked. Of the women interviewed, 28 said they do not smoke.
Complete the probability table and answer the questions.
Smoker 
Nonsmoker 

Men 
19 
41 

Women 
32 
28 

Conditional Probability 

Questions 
Answers 

e. 
What is the probability of randomly selected a man who smokes? 

f. 
What is the probability of randomly selecting a man? 

g. 
What is the probability of randomly selecting someone who smokes? 

h. 
What is the probability of randomly selecting a man who smokes? 

i. 
Out of a group of smokers, what is the probability of randomly selected a man? 
Smoker  NonSmoker  
Men  19  41  60 
Women  12  28  40 
31  69  100 
e.
What is the probability of randomly selected a man who smokes?
P(the man who smokes)=19/100 = 0.19
f.
What is the probability of randomly selecting a man?
P(men)=0.6
g.
What is the probability of randomly selecting someone who smokes?
P(Smoker)=31/100=0.31
h.
What is the probability of randomly selecting a man who smokes?
P(the man who smokes)=19/100 = 0.19
i.
Out of a group of smokers, what is the probability of randomly selected a man?
P(MenSmoker) = 19/100/31/100=19/31= 0.6129
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