Question

In Salem, 82% of the households have cable television and Internet access and 90% of the houses have cable television. What is the probability that a house has Internet access given that it has cable television?

A) 8%
B) 67%
C) 73%
D) 91%

Answer 1

The answer is D. 91%

Answer 2

The formula for conditional probability is:

`P(A|B)=(P(A\cap B))/(P(B))`

`P(I|C)=(P(I\cap C))/(P(C))=(0.82)/(0.90)=0.91`
The correct answer choice is therefore D) 91%