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Variance and Standard Deviation in Probability
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Discrete Random Variable with Finite Outcomes
Variance is the sum of the product of each outcome's probability and the square of its deviation from the mean.
Continuous Random Variable with Probability Density Function (PDF)
Binomial Random Variable (n independent trials, each with success probability p)
Poisson Random Variable (events in fixed interval with mean rate )
Variance is equal to the mean rate .
Uniform Random Variable (continuous, with range to )
Exponential Random Variable (time until event with rate )
Variance is given by .
Normal Random Variable (mean and variance )
Variance is given by parameter . Standard Deviation is
Geometric Random Variable (number of trials until first success, with success probability p)
Hypergeometric Random Variable (successes in samples without replacement)
Negative Binomial Random Variable (number of trials until r-th success)
Multinomial Random Variable (n independent trials, each with k possible outcomes)
For any two outcomes and , if . For outcome , . Standard Deviation
Chi-Squared Random Variable (sum of squares of k standard normal random variables)
Variance is where is the degrees of freedom. Standard Deviation
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