(A) SD(X)−SD(Y)
(B) SD(X)+SD(Y)
(C) SD(X)+SD(Y)−−−−−−−−−−−−−−√
(D) Var(X)+Var(Y)−−−−−−−−−−−−−−−√
»Important Links:
Online Test Preparation and Mcqs Website.
(A) SD(X)−SD(Y)
(B) SD(X)+SD(Y)
(C) SD(X)+SD(Y)−−−−−−−−−−−−−−√
(D) Var(X)+Var(Y)−−−−−−−−−−−−−−−√