Over 140 pounds.
While I certainly agree that the 140lb “average adult” number is somewhat flawed, the real problem here seems to be the construction and stability of the Ethan Allen, and probably the inspection and certification procedures of the state. The fact that her sister vessel became unstable after only 1400 pounds is very telling in this regard.
I can tell you that the Ethan Allen would have never been certificated to carry that many passengers were it operating on federal waters.
Oh, and I’m over 140lbs.
Yes.
But is all mussel! Is rock hard mussel! You feel bicep now!
never, ever have.
yes
yes
Yes.
And if I’m allowed to have Papa Zappa’s stats included here too, add another Yes to that total.
Then again, I’m quite tall and weighing less than 140 pounds would leave me rather underweight.
Yes.
Yes. If my weight ever got down to 140 pounds, it would be because I was wasting away on a desert island, or something like that.
Yes
Nope
Yes.
The standard weight used to calculate weight & balance for airplanes is 170 pounds. (I’m under that)
Brian
Yes.
Not quite sure how (I don’t think I look like I weigh 140+), but yes.
Yes
Yes
Nope.
Never even hit 140 when I was 9 months pregnant.
I, am a puny wimp. 
Yep.
Yes.
Yes.