1. The Addition Rule & More
Statistics and Probability

2. Mutually Exclusive Events
If two events “A” and “B” cannot occur at the same time then they are mutually exclusive!
It is a known fact that…

3. A B Venn Diagram Review… Event A: Likes chocolate ice cream
Event B: Likes vanilla ice cream

4. Let’s go back to mutually exclusive
A and B aren’t mutually exclusive A B D
A and B
A or B
C and D are mutually exclusive C

5. Is it or is it not that is the question…
Decide if the events are mutually exclusive.
Event A: Roll a 3 on a die.
Event B: Roll a 4 on a die.
Event A: Randomly select a male student
Event B: Randomly select a nursing major
Event A: Randomly select a blood donor with type O blood
Event B: Randomly select a female blood donor.

6. The Addition Rule The probability that events A or B will occur:
For not mutually exclusive events
For mutually exclusive events

7. Examples
You select a card from a standard deck. Find the probability that the card is a 4 or an ace.

8. Examples
You roll a die. Find the probability of rolling a number less than three or rolling an odd number.

9. You Try…
A card is selected from a standard deck. Find the probability that the card is a face card or a heart.