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Standard deviation is ______

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Standard deviation is ______

(a) Rms value of dc

(b) Rms value or ac

(c) Either ac or dc

(d) Neither dc nor ac

I got this question in unit test.

This interesting question is from Random Signals in section Signals and Spectra of Digital Communications

1 Answer

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Correct answer is (b) Rms value or ac

Explanation: The standard deviation of a random variable gives the rms value of an ac component.

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