A fair coin is tossed until it lands heads up. What is the probability that heads first appears on an odd numbered toss?
On average, who is more likely to win: Alice, Carla, or are the probabilities equal?
1% of people have a rare cancer, and there is a test for this cancer which is "90% accurate"; that is:
If you have the cancer there is a 90% chance the test will be positive.
If you don't have the cancer there is a 90% chance the test will be negative.
If you take the test and test positive, what is the approximate probability that you have the cancer?
Note: When you eat a course, you only pick one of the choices.