Probability

A number that tells how likely an event is to happen.

• probability

• outcome

• event

• simulation

20% probability

• certain

• likely

• unlikely

• uncertain

100% probability

• certain

• likely

• unlikely

• uncertain

List of every possible outcome

• chance experiment

• probability model

• simulation

• sample space

What is the probability of opening a book with 428 pages in it to page 45?

• the numbers 1 to 428

• 1/428

• 1/2

• 45/428

The probability of opening a book with 428 pages to an even numbered page.

• the numbers 1 to 428

• 1/428

• 1/2

• 25

The chance of getting a Head when flipping a fair coin is 50/50. Peter flips his coin 10 times and he gets only two Heads. So the chance of getting Head is really 2 out of 10. Why?

• Because Peter was not lucky enough. It should be an even chance of getting Head/Tail in coin flipping

• Because what we predict is different to what actually happen

• Because when you flip the coin once, the chance of getting Head is 50/50. But when you flip the coin more than once, this chance changes.

• Because Peter only flips 10 times, if he flips 100 times. The probability is going to be 50/50

• 60/105

• 60/95

• 60/188

• 60/83

The chart below represents the number of marbles in a jar.

P(not green) =

• 28/38

• 10/38

• 14/19

• 80%

A bucket contains 5 yellow and 7 red marbles. If 2 marbles are selected randomly without replacement, what is the probability that one will be yellow and the other will be red?

• 35/132

• 20/132

• 42/132

• 35/144