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The definition of "plain" RMS is the square-root of the sum of the squares.
That gives the equivalent power value of the waveform (normally used in signal analysis), which is why the square is used (since power is proportional to the square of the voltage).
It's not the average value.
Does that answer your question?
A noise bandwidth of 200 kHz links both values, also explained in the above quoted article. More details in your favorite electronic circuits design textbook.
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