Probability is the likelihood of something happening in the future.
It is expressed as a number between zero (can never happen) to 1
(will always happen).
It can be expressed as a
decimal, or a
Here is a table of typical probabilities:
|as a fraction
||as a decimal
||as a percent|
| The sun rises in the morning||1||1.0||100%|
|A flipped coins turns up 'heads'||1/2||0.5||50%|
|A card drawn out of a deck is a club ||1/4||0.25||25%|
|A card drawn out of a deck is a spade, heart, or diamond
|A kid flies by flapping her arms||0||0.||0%|
To learn more about probability, see the probability notes.
Here are a couple of problems for you:
- What is the probability of a birthday being on a Tuesday? _____
- What is the probability of drawing a red card out of a standard deck of 52 cards? _____