Re: Probability questions- plz help

Posted by Sinistral on May 30, 2013; 6:22pm
URL: http://discussion-forum.276.s1.nabble.com/Probability-questions-plz-help-tp7581507p7581511.html

there cant be more than 2 male children. i.e. either 0 male child or 1 male child or 2 male children.

2 kids family:
possible only if: MM

3 kids family:
Possible only if last child is a male and either of first 2 are males ie FMM, MFM

4 kids family:
0 male child:  FFFF
1 male child:  MFFF,FMFF,FFMF,FFFM
2 male children:  (last child is male) : MFFM,FMFM,FFMM
 
Ms=16
Fs=24
sex ratio = no females per 1000 male = (24/16)*1000=1500