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Expectations and Probability

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Consider a graph having n vertices labeled 1,2,...n, and suppose that between each of the
n
2

Pairs of distinct vertices an edge is, independently, present with probability p. The degree of vertex i, designated as Di, is the number of edges that have vertex i as one of its vertices.
(a) What is the distribution of Di
(b) Find correlation between Di and Dj
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(See attached file for full problem description)

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https://brainmass.com/statistics/probability/expectations-and-probability-46360

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Detailed solution is provided about the expectations in probability. The solution explains in words and with equations.

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