probability

The random variables X and Y have the joint PMF

pX,Y(x,y)={c⋅(x+y)2,0,if x∈{1,2,4} and y∈{1,3},otherwise.
All answers in this problem should be numerical.

Find the value of the constant c.

c=
Find P(Y<X).

P(Y<X)=
Find P(Y=X).

P(Y=X)=
Find the following probabilities.

P(X=1)=
P(X=2)=
P(X=3)=
P(X=4)=
Find the expectations E[X] and E[XY].

E[X]=
E[XY]=
Find the variance of X.

var(X)=

  1. 👍 2
  2. 👎 0
  3. 👁 2,137
  1. c= 5/64

    P(Y<X)= 83/128

    P(Y=X)= 1/32

    P(X=1)= 10/64

    P(X=2)= 17/64

    P(X=3)= 0

    P(X=4)= 37/64

    E[X]= 3

    E[XY]= 227/32

    var(X)= 3/2

    1. 👍 10
    2. 👎 0
  2. Wrong answer for c

    1. 👍 4
    2. 👎 0
  3. c=1/128

    1. 👍 3
    2. 👎 0

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