Probability Mutually Exclusive Addition Rule

If a spinner is numbered 1 – 8, are the events of spinning an odd number and spinning an "8" mutually exclusive?

• Yes, these are Mutually Exclusive (no overlap).

• No, these are NOT Mutually Exclusive (overlap).

If you roll a single six-sides die, what is the probability of getting an odd number or a "4"?

• 2/3

• 1/3

• 1/2

• 1/6

What is the probability of getting a milk chocolate or a dark chocolate?

• 3/4

• 1/2

• 1/15

• 3/10

Is rolling an odd number and rolling an even number on a normal six-sided die mutually exclusive?

• Yes, these are Mutually Exclusive (no overlap).

• No, these are NOT Mutually Exclusive (overlap).

What are mutually exclusive events?

• Events that can happen at the same time.

• Events that cannot happen at the same time.

• Events that add up to 100%

• Events that are very special.

When rolling a single six-sided die, what is the probability of rolling an even number or a "5"?

• 1/2

• 5/6

• 2/3

• 1/12

Two events are _________ if they cannot happen at the same time

To find the probability of Event A OR Event B happening, what rule do we use?

• Addition Rule

• Multiplication Rule

• Complement Rule

• Subtraction Rule

If we have non-mutually exclusive events, how does the addition rule change?

• There is a part we have to multiply

• There is a part we ahve to divide

• There is an extra added part

• There is an extra subtracted part

Event A has a 1/2 chance of occurring, Event B has a 1/2 Chance of occurring and they have a 1/4 chance of happening at the same time. What is the probability of Event A or Event B happening?

• 1

• 1/2

• 1/4

• 3/4

Answer explanation

You use the Addition rule of Non-ME Events

P(A or B)=P(A)+P(B)-P(A and B)