# 2024 – Conditional Probability 1 What is the textbook s definition of probability 2 If there

week 2 discussion business statistics – 2024

## Conditional Probability

2024 – Conditional Probability 1 What is the textbook s definition of probability 2 If there.

1.  What is the textbook’s definition of probability?

2.  If there are 3 green marbles and 4 red marbles in a bag, and you were asked to draw one without looking, what is the probability of drawing one green marble?

## Marble back

3.  If you don’t put that marble back, what is the probability of drawing another green marble?

4.  What is the textbook’s definition of conditional probability?

## Conditional probability question

5.  Using the above “marbles in the bag” scenario, what is a conditional probability question that you can make from it?

In §4.4 we are introduced to the concept of conditional probability.  The notation P(A | B) denotes the probability of event A occurring given that we know event B has occurred.

Now consider the Monty Hall Problem introduced in the following videos: