1. Section 7.1 – Day 2

2. Mutually Exclusive Events
Two events A and B are mutually exclusive if A and B cannot happen at the same time.
Event A: Roll a 3 on a die.
Event B: Roll a 4 on a die.
Mutually Exclusive
Event B: Roll an odd number on a die.
Not Mutually Exclusive

3. Mutually Exclusive Events
Event A – Randomly select a blood donor with type O blood.
Event B – Randomly select a female blood donor.
Not Mutually Exclusive
Event A – Randomly select a Ford truck.
Event B – Randomly select a Chevy truck.
Mutually Exclusive

4. The Addition Rule
The probability that events A or B will occur P (A or B) is given by P(A or B) = P(A) + P(B) – P(A and B)
If events A and B are mutually exclusive, the rule can be simplified to P(A or B) = P(A) + P(B).

5. The Addition Rule
You select a card from a standard deck (52). Find the probability of selecting a 4 or an ace:
P (4 or ace) = P(4) + P(ace) = 4/52 + 4/52 = 8/52 ~0.152
You roll a die. Find the probability of rolling a number less than 3 or rolling an odd number:
P (less than 3 or odd) = P(less than 3) + P(odd) – P(less than 3 and odd)
=2/6 + 3/6 – 1/6 = 4/6 ~ 0.67

6. Group Work
White Book: Page …#9-14,