Signals and Systems - Engineering

Q1:

X and Y are two random variable and Z = X + Y. Let σx2, σy2 and σz2 be variance of X, Y and Z. Then

A σz2 = σx2 + σy2

B σz2 ≤ σx2 + σy2

C σz2 < σx2 + σy2

D σz2 > σx2 + σy2

ANS:A - σz2 = σx2 + σy2

No answer description is available.