What is the definition of conditional probability?
1 Answer
The conditional probability of an event B is the probability that the event will occur given the knowledge that an event A has already occurred.
Explanation:
The conditional probability of an event B is the probability that the event will occur given the knowledge that an event A has already occurred. This probability is written
In the case where events A and B are independent (where event A has no effect on the probability of event B), the conditional probability of event B given event A is simply the probability of event B, that is
Example: Suppose there are 2 blue and 3 red marbles are in a bag. What is the probability of getting two blue marbles, say without replacement? Chances of getting first marble appear to be