A Family of 4
Probability
Level
2
A family has 2 children, what is the percentage for this family of having a son and a daughter?
This is one part of 1+1 is not = to 3 .
50
75
25
33
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1 solution
There are only 4 cases, that is ( B , b ) , ( B , g ) , ( G , b ) , ( G , g ) where B stands for boy, G stands for girl, capital letters stand for the first child, and small letters stand for the second child. Obviously, 2 out of 4 conditions which is ( B , g ) and ( G , b ) are both a son and a daughter. So, the probrability for having a son and a daugter is 50%.