Discuss the below problem:
Q: A total of 15 observations have been taken on a head baker for a school district. The numerical breakdown of the baker's activities is: Make Ready (2); Do (6); Clean (3); Idle (4). Based on this information, how many work-sampling observations are required to determine how much of the baker's time is spent in "doing"? Assume a 5 percent desired absolute accuracy and 95 percent confidence level