<span>it all looks confusing when we try to juggle with all those numbers in the head. The problem can be solved systematically by constructing a contingency table. </span>role/gender B G total speaking...... 4 4 8 <span> silent............ 4 8 12 total............. 8 12 20 </span>Probability of a child having a speaking part is therefore (4+4)/20=8/20=2/5 a. 2/5