PROBABILITY
distribution of a discrete variable
A function of probability of a discrete variable is a function that associates each value, xi, of the random variable to its probability, pi.
•f(xi)=P(xi)=pi
•The sum of the probabilities is 1:
•Example: if we flip a coin and random variable is number of heads, then:
The mean and standard deviation of a discrete variable are:
In the example:
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