Discrete Marginal Distributions

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The joint mass function of a pair of discrete random variables computes probabilities regarding the location of the pair in the plane:
. From this it is possible to derive the two marginal mass functions. The first marginal mass function
computes probabilities regarding the location of the variable
:
; and the second mass function computes probabilities regarding the second variable,
:
.
Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA
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"Discrete Marginal Distributions"
http://demonstrations.wolfram.com/DiscreteMarginalDistributions/
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Published: March 7 2011