1. The following table gives the PDF (Probability Density Function) of the discrete variable X -1 -2 2 3 4 f(x) 0.1 0.2 0.1 0.3 0.1 0.2 Calculate the E(x) (expectation) and var(x) (variance)

Managerial Economics: A Problem Solving Approach
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ISBN:9781337106665
Author:Luke M. Froeb, Brian T. McCann, Michael R. Ward, Mike Shor
Publisher:Luke M. Froeb, Brian T. McCann, Michael R. Ward, Mike Shor
Chapter17: Making Decisions With Uncertainty
Section: Chapter Questions
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1. The following table gives the PDF (Probability Density Function) of the
discrete variable X
X
-1
-2
2
3
4
f(x)
0.1
0.2
0.1
0.3
0.1
0.2
Calculate the E(x) (expectation) and var(x) (variance)
2. Prove the following properties of expectation and variance:
If a and b are constants, X and Y are random variables, then
E(aX+b)=aE(x)+b
var (aX+ b) = a² var (X)
var (X+ Y)= var (X) + var (Y) +2 cov(X, Y)
=var (X) + var (Y) + 2pox0y
Of which p is correlation coefficient, oz and o, are standard error of X
and Y.
3. Assume that X- N(6, 4). What is the probability that 2 <X<10, and
what is the probability that X>10?
Transcribed Image Text:1. The following table gives the PDF (Probability Density Function) of the discrete variable X X -1 -2 2 3 4 f(x) 0.1 0.2 0.1 0.3 0.1 0.2 Calculate the E(x) (expectation) and var(x) (variance) 2. Prove the following properties of expectation and variance: If a and b are constants, X and Y are random variables, then E(aX+b)=aE(x)+b var (aX+ b) = a² var (X) var (X+ Y)= var (X) + var (Y) +2 cov(X, Y) =var (X) + var (Y) + 2pox0y Of which p is correlation coefficient, oz and o, are standard error of X and Y. 3. Assume that X- N(6, 4). What is the probability that 2 <X<10, and what is the probability that X>10?
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