jnu sss 2018, stats question

Posted by soimmoi on
URL: http://discussion-forum.276.s1.nabble.com/jnu-sss-2018-stats-question-tp7608207.html

Mean x= 1 ; Var X= 9
Y= 3X+6
W= -3X+6
which of following is true
a) Cov. W&Y cannot be calculated
b) cov W&Y = -9
c) correlation W&y =-1
d) correlation W&y = 1

I'm getting b as answer, is it correct?