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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.1: Measures Of Center

Problem 9PPS

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Suppose that X, Y and Z are independent. The expected value is given by
E(X) = 0, E(Y) = 1, E(Z) = 5
We also know that the variance is given by
Var(X)=1, Var(Y)=1, Var(Z)=25
The values of the covariance are
Cov(X,Y)=2, Cov(Y,Z)=1
Which of the satements are true?
1. Cov(ex,Y2 + 1) = 0
2. Е(XY)-1
3. If a and b are real numbers then Cov(aX+bZ, Y+Z)=2a+25b
4. Cov(X,Y)=0

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A poisson random variables has f(x,3)= 3x e-3÷x! ,x= 0,1.......,∞. find the probabilities for X=0 1 2 3 4 and also find mean and variance from f(x,3).?
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