Question

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. Use the data table to complete parts​ (a) and​ (b) below.
Sexes of Twins
​boy/boy
​boy/girl
​girl/boy
​girl/girl

Identical Twins
5
0
0
5
Fraternal Twins
10
10
10
10
a. After having a​ sonogram, a pregnant woman learns that she will have twins. What is the probability that she will have identical​ twins?
The probability is
nothing.
​(Type an integer or a simplified​ fraction.)
b. After studying the sonogram more​ closely, the physician tells the pregnant woman that she will give birth to twin boys. What is the probability that she will have identical​ twins? That​ is, find the probability of identical twins given that the twins consist of two boys.
The probability is
nothing.
​(Type an integer or a simplified​ fraction.)

Answer 1

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