Chapter 5 - Probability

Question 1

When is a tree diagram used?

Answer 1

To show the outcomes of multiple events happening in succession

Question 2

What is an experiment?

Answer 2

A repeatable process that gives rise to a number of outcomes

Question 3

What is an event?

Answer 3

A collection of one or more outcomes

Question 4

What is the sample space?

Answer 4

The set of all possible outcomes

Question 5

How would you work out the probability of an event occurring when all events are equally likely?

Answer 5

Divide the number of outcomes in the event by the total number of possible outcomes

Question 6

What does P(A) mean?

Answer 6

The probability of A occurring

Question 7

What does P(AnB) mean?

Answer 7

The probability of both A and B happening

Question 8

What does P(AuB) mean?

Answer 8

The probability of A, B or both occurring

Question 9

What does P(A’) mean?

Answer 9

The probability of A not occurring

Question 10

What are mutually exclusive events?

Answer 10

Events that have no outcomes in common

Question 11

For mutually exclusive events, what does P(A or B) equal?

Answer 11

P(A) + P(B)

Question 12

What are independent events?

Answer 12

When one event has no effect on another

Question 13

For independent events, what does P(A and B) equal?

Answer 13

P(A) x P(B)