Lectures – 3.2 Conditional Probabilities

There are five cars on sale.
Two BMW’s, one of which has a sunroof.
Three Mercedes, two of which have a sunroof.
I bought a car with sunroof.
What’s the probability it was a BMW?

• A. 1/3
• B. 1/2
• C. 2/3

Let A and B be independent events.
Pr(A) = 0.5, Pr(B) = 0.4.
What is Pr(A U B)?

• A. 0.3
• B. 0.7
• C. Not enough information