Verify that f(x) is a pdf. Find E X and Var X.

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter2: Functions And Graphs
Section2.6: Proportion And Variation
Problem 18E
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Let X have the pdf
f(x) =
4
β
3√π
x
2e
−x
2
⁄β2
, 0 < x < ∞, β > 0.

a. Verify that f(x) is a pdf.
b. Find E X and Var X.

Let X have the pdf
* /s°,
4
-x2
f(x) :
x²e
0 < x < 0, B > 0.
%3D
a. Verify that f (x) is a pdf.
b. Find E X and Var X.
Transcribed Image Text:Let X have the pdf * /s°, 4 -x2 f(x) : x²e 0 < x < 0, B > 0. %3D a. Verify that f (x) is a pdf. b. Find E X and Var X.
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