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White noise has _____ mean and ______ variance.

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White noise has _____ mean and ______ variance.

(a) Zero and zero

(b) Finite and zero

(c) Zero and finite

(d) One and zero

I got this question in an internship interview.

The above asked question is from Random Signals topic in portion Signals and Spectra of Digital Communications

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Right option is (c) Zero and finite

To explain: White noise is a zero mean function with infinite average power, finite variance and infinite bandwidth.

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