SOLUTION: In a certain city, 55% of the families own only one car and 20% own exactly two cars. One family is selected at random. Find the probability that the family selected has a)one o tw

Algebra ->  Probability-and-statistics -> SOLUTION: In a certain city, 55% of the families own only one car and 20% own exactly two cars. One family is selected at random. Find the probability that the family selected has a)one o tw      Log On


   

Question 1097088: In a certain city, 55% of the families own only one car and 20% own exactly two cars. One family is selected at random. Find the probability that the family selected has a)one o two cars b)no car or owns more than two cars.
Please help me answer this.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
P%281%29=0.55
P%282%29=0.20
So then,
a) P%281_or_2%29=P%281%29%2BP%282%29=0.55%2B0.20=0.75
.
.
.
b) The complement of owning exactly one or exactly 2 is owning exactly 0 or more than 2. So,
P=1-P%281_or_2%29
P=1-0.75
P=0.25