A work sampling study was conducted to determine the proportion of the time a worker is idle. The following information was gathered on a random basis: Number of Times Total Number Day Worker Idle of Observations Monday 10 48 Tuesday 19 60 Wednesday 13 43 Thursday 13 51 a. Based on these preliminary results, what percent of the time is the worker working? The worker is working % of the time. (Enter your response rounded to two decimal places.) b. If idle time is judged to be excessive, what additional categories might you add to a follow-up work sampling study to identify the root causes? (Mark all that apply.) | A. Quality assurance B. Waiting for a customer order C. Performance of workers OD. Breaks