Chapter 4 Mini Recap

If an event cannot occur, the probability is

• 0
• 1
• 0.5
• Infinity

The collection of all possible outcomes of a probability experiment is called a

• Variable
• Sample Size

• Sample Space
• Data Set

An outcome or collection of outcomes from a sample space is called an

• Event
• Experiment
• Probability
• Complement

The General Addition Rule is used for probabilities of the form P(A or B).

True or False

• True
• False

If an event occurs, then its complement also occurs.

True or False

• True
• False

If P(A) = 0.3 , P(B) = 0.4 and P(A or B) = 0.7. Are A and B mutually exclusive?

• Yes, A and B are mutually exclusive
• No, A and B are not mutually exclusive

If P(A)= P(A^c) , Find P(A)

• 0.5
• 0.25
• 0.75
• 1

A: Sophie is a member of the debate team; B: Sophie is the president of the theater club.

Are those two events mutually exclusive?

• Yes, because Sophie cannot be a member of two clubs at the same time
• No, because Sophie can be a member of the debate team and also be the president of the theater club
• Yes, because being a member of the debate team and being the president of the theater club are two different roles
• No, because being a member of the debate team and being the president of the theater club are the same role

A red die and a blue die are rolled. A: The red die comes up 1; B: The total is 9.

Are these two events mutually exclusive?

• Yes, they are mutually exclusive
• No, they are not mutually exclusive
• Yes, they are dependent
• No, they are independent

A sample of 225 internet users was selected.

A : More than 200 of them use Google as their primary search engine.

Find the complement of A.

• 200 or fewer of them use Google as their primary search engine

• Exactly 200 of them use Google as their primary search engine
• 200 of them do not use Google as their primary search engine

• 225 of them use Google as their primary search engine