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 8 8. Fraternal Twins a. After having a sonogram, pregnant woman learns that she will have twins. What is the probability that she will have identical twins? The probability is (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 N (Type an integer or a simplified fraction.)

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