What is a probability function?

1. Given a discrete random variable

Given a discrete random var (See: What is a discrete random variable? ),

Each value in the range (not the domain!) has an associated probability p.

This association/relation is defined as a probability function

f(x) = p

See also:

Laws

Given a range X for a discrete random variable,

  1. f(x) > 0 for all x ∈ X

  2. Sum of all x is 1.

2. Alternative definition

Probability density function