• Probability
  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 fraction, a decimal, a percent, or as "odds".
  Here is a table of typical probabilities:
  
  

  EVENT	Probability
  	..as a fraction	..as a decimal	..as odds against
  The sun rises in the morning	1	1.	0.
  A flipped coins turns up 'heads'	1/2	.5	1:1
  A card drawn out of a deck is a club	1/4	.25	3:1
  A card drawn out of a deck is a spade,heart, or diamond	3/4	.75	1:3
  A kid flies by flapping her arms	0	0.	infinite

  To learn more about probability, see the probability notes.

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