## Quick Reference

Suppose that *X* and *Y* are discrete random variables with joint probability mass function *p*. Then the marginal distribution of *X* is the distribution with probability mass function *p*_{1}, where

A similar formula gives the marginal distribution of *Y*.

Suppose that *X* and *Y* are continuous random variables with joint probability density function *f*. Then the marginal distribution of *X* is the distribution with probability density function *f*_{1}, where

*Subjects:*
Mathematics.

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