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Cool Off A survey of southern California houses in a given town shows that 70% of the homes have an air conditioning system and 90% of home have at least one ceiling fan. 65% of all homes surveyed had both features.
a. What is the probability that a randomly selected home neither feature?
b. What is the probability that a randomly selected home has a ceiling fan, given that it already has an air conditioning system?
c. Do these two house features appear to be independent? Justify your answer.
Textbook 

Stats: Modeling the World


Edition: 4th
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a. 5%
b. 92.9%
c. Yes. The probability of having a fan is 90% and if you have AC it is 92.8%.
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