Question 430492
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Hi
A realty company has 100 homes listed for sale
           G-only   F-only       both     neither   Total
status      30        10          50        10       100

P( that the home selected does not have a fire place)= 1 - 60/100 = 40/100
P(that the home selected has a fireplace or a garage) 
 P(A or B) = P(A) + P(B) - P(A and B) = 90/100 - 50/100 = 40/100 
P(that the home selected had neither a fireplace nor a garage)= 10/100
P(that the home selected has a garage but not a fireplace)= 30/100
P(the home selected has a garage, given that it has a fireplace) 
   P(A|B) = P(A and B)/P(B)= 50/100/60/100 = 50/60
may reduce fractions as necessary for classroom format.