Question 1186830
<pre>
It's pretty obvious that on the average they would have 2 boys and 2 girls.
There are 2<sup>4</sup> = 16 possible birth orders for the 4 children listed
below:

birth| number
order|  of
     | boys 
-------------
BBBB |  4
BBBG |  3
BBGB |  3
BBGG |  2
BGBB |  3
BGBG |  2
BGGB |  2
BGGG |  1
GBBB |  3
GBBG |  2
GBGB |  2
GBGG |  1
GGBB |  2
GGBG |  1
GGGB |  1
GGGG |  0
---------
 sum = 32
average = 32/16 = 2 boys.

Edwin</pre>