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Assignment Assignment> open Assignment ASSIGNMENT R 3.4 Problem 3.059 dPractice Reading Incorrect An Dom The following function is probability mass function. f (x) teview Score Determine the mean, μ, and variance, σ, of the random variable. Enter the exact answers (as fractions if necessary) Oblective Moble Site Statistical Tables and Charts Click if you would like to Show Work fer this questien Qn Shom Weck Question Attempts: 1 of 3 used SAVE FOR LATER SUBMIT ANSWER

Answer 1

3.059)

x	P(x)	xP(x)	x2P(x)
-2	1/8	-0.250	0.500
-1	1/4	-0.250	0.250
0	1/4	0.000	0.000
1	1/4	0.250	0.250
2	1/8	0.250	0.500
	total	0.000	1.500
	E(x) =μ=	ΣxP(x) =	0.0000
	E(x2) =	Σx2P(x) =	1.5000
	Var(x)=σ2 =	E(x2)-(E(x))2=	1.500

from above mean μ=0

and variance σ² =3/2

3.060)

x	P(x)	xP(x)	x2P(x)
1	16/21	0.762	0.762
2	4/21	0.381	0.762
3	1/21	0.143	0.429
	total	1.286	1.952
	E(x) =μ=	ΣxP(x) =	1.2857
	E(x2) =	Σx2P(x) =	1.9524
	Var(x)=σ2 =	E(x2)-(E(x))2=	0.299

mean μ=1.286

variance σ² =0.299