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Secure Secure https://www.matholeom/Student/PlayerTestaspr?testld-183429988 acerterwinayes MA120DLBU1A2018 van snyder & 6a0/11241 PM Stat ist Quiz: Unit 4: Quiz This 2 af 17 (3 complere) ome Identical twins come from a single egg that split into two embryos, and fratermal twins are from separate fernized eggs Also, identical twirs must be of the same se and the sexes are equaly likely, and seces of fratemal twins are equaly ikely Use te dats table to complete parts (al and (bj below & Tests Sexes of Twins boyiget gisboy grligirl Identical Twins Fraternal Twins a. Ator having a sonogram, a pregnant woman learms that she wil have twins What is th probability that she will have idenical twine? Type an ieteger or a simplited fraction) ch ConentsThe proi rSuccess After studying the sonogram more closely, the physican tells ths pregnant woman that she will give birth to twin boys. Whatis tha probsblity that she wil have b. dantical twins? That is find the probablity of identical twins given that the teins consist of two boys e Optons The probabily sD Type an integer or a simplified taction j n Tutor Enter your answer in each of the anpwer bokes

Explanation / Answer

a) Total identical twins = 3 + 3 = 6
Total fraternal twins = 7 + 7 + 7 + 7 = 28

Therefore probability that twin is identical is computed as:

= (6 / (6 + 28 ) )

= 6 / 34

= 3 / 17

Therefore 3 / 17 is the required probability here.

b) Given that there are 2 boys as the twins, probability that they will be identical twins is computed as:

= Number of B / B with identical twins / Total B / B cases

= 3 / 10

Therefore 3/10 is the required probability here

Note that both fractions are simplified

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