Chances for Male/Female

Why is it a 50-50 chance that a baby will be a boy/girl rather than something else, like 55-45, etc.?

right.  we get the point that by cell production, it's a 50-50 chance.  applause all around.

the problem is, the birth ratio of men to women, globally, is 1.07 male/female.  for those stellar statisticians who were posting above, that means 107 dudes are born for every 100 chicks.  in the u.s. the ratio is 1.05 m/f, e.u. is about 1.06 m/f, china is 1.11 m/f.

soooooo biology be damned, it's not actually 50/50.  O shit!