Mutually Exclusive and Not Mutually Exclusive Events

Experimental Probability is:

• What Will happen 
• What actually happens
• What should happen
• What I think Happens

Theoretical Probability is:

• What should happen
• What happens
• What I think should happen
• What I want to happen 

Find the probability of drawing a 10 from a standard deck of 52 cards.

• 1/13

• 10/52

• 5/26

• 4/52

Two events are mutually exclusive if:

• they cannot happen at the same time
• they can happen at the same time
• they always happen 
• they never happen 

Which formula do you use when two events are mutually exclusive?

• P(A or B) = P(A) + P(B)
• P(A or B) = P(A) + P(B) - P(both)
• P(A and B) = P(A) * P(B)
• P (A and B) = P(A) * P(B|A)

If you roll one die, what is the probability of getting an odd number or a 4?  Are the events inclusive or mutually exclusive?

• Not Mutually Exclusive 
• Mutually exclusive

If you roll one die, what is the probability of getting an odd number or a 4?

• 2/3
• 1/3
• 1/2
• 1/6

A bag contains 9 green marbles, 5 yellow marbles and 6 red marbles.  You choose one marble.   What is the probability of selecting a green or red marble?  Are these events inclusive or mutually exclusive?

• Not Mutually Exclusive 
• Mutually exclusive

A bag contains 9 green marbles, 5 yellow marbles and 6 red marbles.  You choose one marble.   What is the probability of selecting a green or red marble?  Do you add or multiply probabilities?

• Add
• Multiply

Two events are not mutually exclusive if:

• they cannot happen at the same time

• they can happen at the same time

• they always happen

• they never happen