# Discrete Random Variables

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- Created by: eleanor
- Created on: 11-04-15 14:54

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- Discrete Random Variables
- is basically the outcomes of a probability experiment where the outcomes are discrete
- P(X = x) refers to the probability that X is equal to a particular x value
- the sum of all the probabilities must add up to one
- this can be used to find a constant or unknown in the probability

- E(x) is the expected values of x
- multiply x with the p(x) then add togehter

- varience= Var(x)
- E(aX+b) = aE(x) + b
- Var(aX + b) = a Var(X)
- Discrete Uniform data
- a discrete random variable X is defined over a set of n distrstinct values
- each value is equally likely
- E(X) = n+1/2
- Var(X) = (n+1)(n-1) / 12

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