Workshop 3 - Basic Probability

Question 1

If an event if certain to occur, what is its probability?

Answer 1

1

Question 2

If an event is certain not to occur, it has a probability of?

Answer 2

0

Question 3

Experiment

Answer 3

Process leading to exactly one of various possible outcomes
E.g. tossing a coin

Question 4

Outcome

Answer 4

Possible things that can happen in an experiment
(E.g. when tossing a coin only two outcomes: heads or tails)

Question 5

Sample space

Answer 5

Set of all possible outcomes
(Tossing a coin sample space is heads or tails)

Question 6

Event

Answer 6

Subset of sample space, that is, a set of some outcomes.

Question 7

Complement of an event

Answer 7

For an event A, the event not A is called the complement
P(not A) = 1 - P(A) because the sum of all probabilities assigned to outcomes in a sample space must be equal to 1.

Question 8

Probability of event A is (if all outcomes equally likely)

Answer 8

P(A) = number of outcomes in the event A / number of outcomes in the sample space S

Question 9

Mutually exclusive

Answer 9

Events are considered this if they cannot occur together
P(A U B) = P(A) + P(B)

Question 10

Not mutually exclusive

Answer 10

Events are considered this if they can occur together

P(A U B) = P(A) + P(B) - P(A^B)