QUESTION 2 2.1 A total of 515 observations were made at random times during a one-week period (a total of 40 hours) in the automatic lathe section. The subjects consisted of 10 identical machines. In each observation, the activity of the machine was identified and classified into one of three categories: (1) being set up, (2) running production, or (3) idle. The number of observations in each category is summarized in the table below. 2.1.1 Estimate how many hours per week an average machine spent in each of the three categories. (7) Category Number of observations 1. Being set up 80 2. Running production 305 3. Machine idle 130 515 [7]