Regarding the link, interesting reading, but the boring long-and-short is that the bookies rarely get these things wrong.
(, Thu 23 Jun 2016, 10:03, Reply)
I don't expect they would let anyone know that data, at least not in detail?
(, Thu 23 Jun 2016, 11:19, Reply)
They are all calculated to entice people to bet in a particular way to ensure that the bookmaker remains in profit against their tracked risk. A large bet in one direction or another in a fifty fifty option can skew odds.
(, Thu 23 Jun 2016, 14:25, Reply)