During a 52 week period a company paid overtime wages for 16 weeks and hired temporary help for 7 weeks. During 6 weeks the company paid overtime and hired temporary help

(a) Are the events "selecting a week that contained overtime wages" and "selecting a week that contained temporary help wages" mutually exclusive?

b) If an auditor randomly examined the payroll records for only one week, what is the probability that the payroll for that week contained overtime wages or temporary help wages?