Answered: If X is a continuous random variables,… | bartleby

Algebra & Trigonometry with Analytic Geometry

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.8: Probability

Problem 32E

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Question

If Xis a continuous random variables, then Cov(x,x)
(a) o
(b)
o
(c)
Hv
(d)
None of them
15- If X and Y are two continuous random variables, then ix-x--
(a) [xx-4)
(c) joix-xx
(d) IxGx-Xldy
If X and Y are two discrete random variables, then y
(a) [Σ*(*)
(b) [(y)
(d) I
74
17- If X is a continuous random variable, then Cov(x, 2 x)=
(a) 4E(xả)
(b) 2E(x²)-2(E(x))²
@4[E(x²)-(E(x))*]
(c) ox
18- If E(x) = 1 and E (x²)=5, then p(x,x)=......
(a) 1
(b) 2
(d) 0
(c)-1
19. If X and Y have trinomial distribution with parameters (.p.p.), then the marginal
probability mass function of X'is given by f(x).......
(a)
x²
(a-x)"
P:(1-P)**
(b)
0-A
x(n-x)"
n!
d
(c)
(d)
PO-P₂)
x-x)!
x!(-x)
20- If X and Y are independent random variables, then Co(x,y).....
(a) o
(b) σ
(c)
(d)
1
16-
#₂

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