A work sampling study was authorized in a department with 9 employees working in it, and it's wanted to know what value of allowance to use for this department. Only two activity categories were considered one of the productive works(work services), and the other is a personal time, rest breaks, and delays. Over a one month period (40 hours/week), 135 observations were made at random times. Each observation captured the category of activity of each of the nine employees in the department of interest. Results indicated that the category of personal time, rest breaks, and delays constituted 13% of the total observations. If a total of 845 work services were done during the 4 weeks, and all activity of the first category was devoted to complete these services, what was the average time spent on each service? Ans 5.4327 hr/service (up to 4 decimals)