Show that the function defined satisfies the properties of a pmf. Show that the formula (4.1) of expectation does not converge in this case and hence E[X] is undefined. [Hint: Rewrite 1/x(x + 1) as 1/x - 1/(x+1).]

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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1. Consider a discrete random variable X with the following pmf:
x = 1, 2,...,
Px (x) =
-{(2+1)
x(x + 1)'
otherwise.
4.2 MOMENTS
F(x)
a
- X
Figure 4.P.1. An alternative method of computing E[X]
Show that the function defined satisfies the properties of a pmf. Show that the
formula (4.1) of expectation does not converge in this case and hence E[X] is
undefined. [Hint: Rewrite 1/x(x + 1) as 1/x - 1/(x+1).]
205
Transcribed Image Text:1. Consider a discrete random variable X with the following pmf: x = 1, 2,..., Px (x) = -{(2+1) x(x + 1)' otherwise. 4.2 MOMENTS F(x) a - X Figure 4.P.1. An alternative method of computing E[X] Show that the function defined satisfies the properties of a pmf. Show that the formula (4.1) of expectation does not converge in this case and hence E[X] is undefined. [Hint: Rewrite 1/x(x + 1) as 1/x - 1/(x+1).] 205
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