My second time submitting this question. The answer is not 3/20. Identical twins
ID: 3152551 • Letter: M
Question
My second time submitting this question. The answer is not 3/20.
Identical twins come from a single egg that split into two embryos, and fraternal twins are from separate fertilized eggs. Also, identical twins must be of the same sex and the sexes are equally likely, and sexes of fraternal twins are equally likely. If a pregnant woman is told that she will give birth to fraternal twins, what is the probability that she will have one child of each sex? Use the data table below to find the probability.
Sexes of Twins
boy/boy, boy/girl, girl/boy, girl/girl
Identical Twins 4 0 0 4
Fraternal Twins 7 3 3 7
The probability is___ ( a simplified fraction.)
Explanation / Answer
P(twins of different sex given faternal twins) = 6/20
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