beat between 100 Hz and 101 Hz

Kraig Grady wrote,

>Is it possible that all people
>undergoing this experiment would tune it to 100.5 or is 100.5 an
>average. no one picks 100.3 or 100.7? It seems to me that any pitch
>in-between could be picked with a higher average around 100.5, that the
>entire range would be equal to the pitch.

If the 100 and 101 Hz tones are of unequal volume, then a 100.5 Hz tone
fluctuating in volume is NOT what is heard. I believe Helmholtz covers
this?