ISS-2021 Statistics Paper-1 Previous year solution |Let the joint PDF of X and Ybe f(x,y)=6(1-x-y);

ISS Indian Statistical Service Statistics Paper-1 Previous Year Question Paper Solution:

Set D Question Number 1,2, & 3

Consider the following for the next three(03) items that follow:

Let the joint pdf of X and Y be

f(x,y)= 6(1-x-y); x>0 ,y>0 , x+y < 1 and 0 ; otherwise

(1) What is the value of E(XY)?

(a) 10

(b) 20

(c) 1/10

(d) 1/20

(2) What is the value of Cov(X,Y)?

(a)1/40

(b) 1/80

(c) -1/40

(d) -1/80

(3) What is the equation of line of regression of X and Y?

(a) X=(3-5Y)/15

(b) X=(1-Y)/3

(c) X=(5-3Y)/15

(d) X= (1-Y)/5

SOLVED ISS 2021 PREVIOUS YEAR QUESTION

STATISTICS PAPER-1 Q.NO. 1-3 and SET-D