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To the right are the outcomes that are possible when a couple has three children

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To the right are the outcomes that are possible when a couple has three children. Assume that boys and girls are equally? likely, so that the eight simple events are equally likely. Find the probability that when a couple has three? children, there are

 

are exactly 3

 

3 girls

 

girls.

1st

2nd

3rd

 

boy

minus

 

−

boy

minus

 

−

boy

boy

minus

 

−

boy

minus

 

−

girl

boy

minus

 

−

girl

minus

 

−

boy

boy

minus

 

−

girl

minus

 

−

girl

girl

minus

 

−

boy

minus

 

−

boy

girl

minus

 

−

boy

minus

 

−

girl

girl

minus

 

−

girl

minus

 

−

boy

girl

minus

 

−

girl

minus

 

−

girl