I'm not sure how to solve this problem...so here goes:
Males and females are observed to react differently to a given set of circumstances. It has been observed that 70% of the females react positively to these circumstances, whereas only 40% of the males react positively. A group of 20 people,15 female and 5 male, was subjected to these circumstances, and the subjects were asked to describe their reactions on a written questionnaire. A response picked at random from the 20 was negative. What is the probabilty that it was that of a male?
Thanx for the help!