The musical note "A" above middle "C" is 440Hz. When you go up an octave, the frequency doubles. When you go down an octave, the frequency halves. A male bass's range goes down to roughly the A 2 octaves below middle C, so that's (440/2)/2 = 110Hz. A female soprano's range extends to roughly the A 2 octaves above middle C, so that's 440*2=880Hz. (I "rounded" to A to make the math easy, the actual range is a little wider. See: [[url=http://[/URL]="http://en.wikipedia…"]Vocal range - Wikipedia, the free encyclopedia[/]="http://en.wikipedia…"]Vocal range - Wikipedia, the free encyclopedia[/])

To the OP: By frequency range, do you mean the range within which the fundamentals of the ranges of the voices lie? I think that's what vttom has explained. Or do you want the frequency range within which all the sounds produced by a male/female voice will fall if a spectrum analyzer is used? That will be typically much wider than the range of the fundamentals, as it will include the non-melodic(unpitched?) aspects of the human voice, including breath sounds, formants and the like.