a.)both babies are boys
b.) a baby and a baby girl are born
c.) both babies are alive
d.)not one of the babies is alive?
2006-08-20 04:44:14 · 5 answers · asked by michelle 1 in Education & Reference ➔ Higher Education (University +)
Your question is a rather complicated one as many factors need to be considered. The only probability that can be calculated is for the general population, which may be different for any individual or couple.
There are five variations of twinning that occur commonly in the world. The three most common variations are all fraternal: (1) boy-girl twins are the most common result, at about 40% of all twins born; (2) girl fraternal twins; (3) boy fraternal twins. The last two are identical: (4) girl identical twins and (5) (least common) boy identical twins.
Assuming that the chance of having a boy is roughly the same as having a girl, there are 2 out of 3 possibilities of having boy twins. Therefore the odds are 2/3, or about 67%.
Keep in mind that if both twins are boys, they could be either fraternal or identical, which is a different statistic.
However, while in the population, the probability of having a boy or a girl is roughly 50/50 (a little higher for boys, a little lower for girls), that in no way implies that a particular person (or couple)has the same likelihood.
1 out of 1000 births results in fraternal twins; 1 out of 1500 births results in identical twins.
I believe it has been shown that the sex of a child is partly dependent on the time difference between the release of an egg and the introduction of the sperm. Thus, in the case of fraternal twins, the sex of one child may be dependent on the sex of the other.
With today's medical care, I would say the probability of live birth of both twins is very hig, but I couldn't find specific information.
These links may help you sort out the specific information you need and you may find them interesting. Best of luck.
2006-08-20 05:22:58 · answer #1 · answered by Anonymous · 4⤊ 0⤋
Approximately:
!/4 chance both boys
1/4 chance both girls
1/4 chance boy/girl
and the other quarter divided into identical twins with same genes, same sex, and with todays technology slim chances that one or both babies don't make it.
2006-08-20 04:55:08 · answer #2 · answered by mixemup 6 · 0⤊ 0⤋
a) 25%
b) 50%
c) >95%
d) <5%
2006-08-20 04:56:36 · answer #3 · answered by akbarshahin 1 · 0⤊ 0⤋
a) 25%
b) 50 %
2006-08-20 04:50:38 · answer #4 · answered by The Cheminator 5 · 0⤊ 0⤋
am sure thers some puclication somewhere that can answer that
2006-08-20 05:01:15 · answer #5 · answered by tru_story 4 · 0⤊ 0⤋