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View Full Document Two Discrete Random Variables
51 Two Discrete Random Variables
51.1 Joint Probability Distributions
Two Discrete Random Variables
51 Two Discrete Random Variables
51.2 Marginal Probability Distributions
he individual probability distribution of a random variable is
• The individual probability distribution of a random variable is
referred to as its
marginal probability distribution
.
general the marginal probability distribution of
an be
• In general, the marginal probability distribution of
X
can be
determined from the joint probability distribution of
X
and
other random variables. For example, to determine
P
(
X = x
),
we sum
P
(
X = x
,
Y = y
) over all points in the range of (
X
,
Y
)
for which
X = x
. Subscripts on the probability mass functions
distinguish between the random variables.
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51 Two Discrete Random Variables
Definition: Marginal Probability Mass Functions
Two Discrete Random Variables
51 Two Discrete Random Variables
51.3 Conditional Probability Distributions
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51 Two Discrete Random Variables
51.3 Conditional Probability Distributions
Two Discrete Random Variables
51 Two Discrete Random Variables
Definition: Conditional Mean and Variance
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View Full Document 51 Two Discrete Random Variables
4I d
d
51.4 Independence
52.1 Joint Probability Distribution
Definition
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This note was uploaded on 02/05/2012 for the course ST 315 taught by Professor Staff during the Fall '11 term at S. Alabama.
 Fall '11
 Staff

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