Sets & Probability (Year 7)

Set: Collection of things

Element: Each item in a set is called an element 

Intersection: the overlapping part of a Venn diagram

Union: Two ellipses that join

Mutually exclusive: Events that do not occur at the same time

Probability: Likelihood of an event happening

Bias: A built-in error that makes all values wrong (unequal) by a certain amount, e.g. a weighted dice

Fair: There is zero bias, and all outcomes have an equal likelihood     

Random: Something happens by chance and is unable to be predicted