Electronics and Communication Engineering - Signals and Systems - Discussion

Discussion Forum : Signals and Systems - Section 5 (Q.No. 26)
26.
X and Y are two random variable and Z = X + Y. Let σx2, σy2 and σz2 be variance of X, Y and Z. Then
σz2 = σx2 + σy2
σz2 ≤ σx2 + σy2
σz2 < σx2 + σy2
σz2 > σx2 + σy2
Answer: Option
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