Hello! Can i get exact answers for this exercise please, thank you :)

Question 4: [a.] A survey of consumers in a particular community showed that 10% were dissatised with plumbing jobs done in their homes. Half the complaints dealt with plumber A, who does 40% of the plumbing jobs in the town. (a) What is the probability that a consumer will obtain an unsatisfactory job and that the job will be done by plumber A?[4 Points] (b) What is the probability that the consumer will have an unsatisfactory job, given that the plumber is A.[4 Points] [b.] 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 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, what is the probability that it was a positive response. [8 Points]