Multiplication Rules for Probability

Given P(A) = .8 and P( B| A) = .3, find P( A and B).

• 2.6

• .12

• .24

• .38

Is the event INDEPENDENT or DEPENDENT?
The spinner is spun twice.  What is the probability that it lands on red first and then blue?

• Independent

• Dependent

What rule would I use to find the probability of event A and event B happening?

• Addition Rule

• Subtraction Rule

• Multiplication Rule

• Complement Rule

What is the Multiplication Rule?

• P(A) ⋅ P(B|A)

• P(A) - P(B)

• P(A) ⋅ P(B)

• P(A) + P(B) - P(A ∩ B)

What is the Multiplication Rule?

• P(A) ⋅ P(B|A)

• P(A) - P(B)

• P(A) ⋅ P(B)

• P(A) + P(B) - P(A ∩ B)

Probability of 2 dependent events

• P(A and B) = P(A) * P(B|A)

• P(A or B) = P(A) + P(B)

• P(A and B) = P(A) * P(B)

• P(A or B) = P(A) + P(B) - P(A ∩ B)

True or False.

"and" relates to the multiplication rule

"or" relates to the addition rule

• True

• False