Question

Find the joint discrete random variable x and y,their joint probability mass function is given by Px,y(x,y)={k(x+y) x=-2,0,+2,y=-1,0,+1

0 Otherwise }

2.1 determine the value of constant k,such that this will be proper pmf?

2.2 find the marginal pmf’s,Px(x) and Py(y)?

2.3 obtain the expected values of random variables X and Y?

2.4 calculate the variances of X and Y?

Answer #1

thank you

Find the joint discrete random variable x and y,their joint
probability mass function is given by
Px,y(x,y)={k(x+y);x=-2,0,+2,y=-1,0,+1 K>0 0
Otherwise } 2.1 determine the value of constant k,such
that this will be proper pmf? 2.2 find the marginal pmf’s,Px(x) and
Py(y)? 2.3 obtain the expected values of random variables X and Y?
2.4 calculate the variances of X and Y?
Hint:££Px,y(x,y)=1,Px(x)=£Px,y(x,y);Py(y)=£Px,y(.
x,y);E[]=£xpx(x);

Let X and Y be discrete random variables, their joint pmf is
given as Px,y = ?(? + ? + 2)/(B + 2) for 0 ≤ X < 3, 0 ≤ Y < 3
Where B=2.
a) Find the value of ?
b) Find the marginal pmf of ? and ?
c) Find conditional pmf of ? given ? = 2

SOLUTION REQUIRED WITH COMPLETE STEPS
Let X and Y be discrete random variables, their joint pmf is
given as Px,y = ?(? + ?)/(B + 1) for 0 < X ≤ 3, 0 < Y ≤ 3
(Where B=5)
a) Find the value of ?
b) Find the marginal pmf of ? and ?
c) Find conditional pmf of ? given ? = 2

SOLUTION REQUIRED WITH COMPLETE STEPS
Let X and Y be discrete random variables, their joint pmf is
given as Px,y = ?(? + ? − 2)/(B + 1) for 1 < X ≤ 4, 1 < Y ≤ 4
(Where B=2)
a) Find the value of ?
b) Find the marginal pmf of ? and ?
c) Find conditional pmf of ? given ? = 3

SOLUTION REQUIRED WITH COMPLETE STEPS
Let X and Y be discrete random variables, their joint pmf is
given as Px,y = ?(? + ? + 1)/(B + 1) for 0 ≤ X < 3, 0 ≤ Y < 3
(Where B=7)
a) Find the value of ?
b) Find the marginal pmf of ? and ?
c) Find conditional pmf of ? given ? = 1

If X and Y are discrete random variables with joint PMF
P(X,Y )(x, y) = c(2x+y)(x! y!) for x = 0,
1, 2, … and y = 0, 1, 2, … and zero otherwise
a) Find the constant c.
b) Find the marginal PMFs of X and Y. Identify their
distribution along with their parameters.
c) Are X and Y independent? Why/why not?

Let X and Y be discrete random variables, their joint pmf is
given as ?(x,y)= ?(? + ? − 2)/(B + 1) for 1 < X ≤ 4, 1 < Y ≤
4 Where B is the last digit of your registration number ( B=3) a)
Find the value of ? b) Find the marginal pmf of ? and ? c) Find
conditional pmf of ? given ? = 3

The random variables, X and Y , have the joint pmf
f(x,y)=c(x+2y), x=1,2 y=1,2 and zero otherwise.
1. Find the constant, c, such that f(x,y) is a valid pmf.
2. Find the marginal distributions for X and Y .
3. Find the marginal means for both random variables.
4. Find the marginal variances for both random variables.
5. Find the correlation of X and Y .
6. Are the two variables independent? Justify.

Let X be a discrete random variable with probability mass
function (pmf) P (X = k) = C *ln(k) for k = e; e^2 ; e^3 ; e^4 ,
and C > 0 is a constant.
(a) Find C.
(b) Find E(ln X).
(c) Find Var(ln X).

Consider a joint probability function for discrete random
variables X and Y. To get the marginal probability function for
X:
Select one:
a. We set x equal to 1.
b. For each value y, we sum the joint probability function over
all the values of x.
c. We set y equal to 1.
d. For each value x, we sum the joint probability function over
all the values of y.

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