Probability

Question 1

What is an experiment?

Answer 1

An experiment is a repeatable process that gives rise to a number of outcomes

Question 2

What is an event?

Answer 2

An event is a collection of one or more outcomes

Question 3

What is a sample space?

Answer 3

A sample space is the set of all possible outcomes

Question 4

What is the probability of an event where outcomes equally likely?

Answer 4

The probability of an event is the number of outcomes in the event divided by the total number of possible outcomes

Question 5

What do all probabilities sum to?

Answer 5

They sum to 1

Question 6

What does mutually exclusive mean?

Answer 6

When events have no outcome in common. They cannot take place at the same time. In a venn diagram, the curves don’t overlap

Question 7

What is the formula for mutually exclusive events?

Answer 7

P(A or B) = P(A) + P(B)

Question 8

What are independent events?

Answer 8

When events take place but don’t affect the probability of either event happening. If A and B are independent then the probability of A happening stays the same whether or not B happens

Question 9

What is the formula for independent events?

Answer 9

P(A and B) = P(A) x P(B)