Group The readings below were obtained from an activity sampling study: ACTIVITY Operator A Operator B Operator C Working 450 405 510 Unproductive 250 240 300 No tools 108 130 23 Supervision 52 85 27 Total Observations a) For the entire group, calculate the maximum and minimum percentage values to be expected for each activity @ 95% reliability basis. (10) b) For operator B activities, calculate the maximum and minimum percentage values to be expected @ 95% reliability basis. (10) c) Calculate the additional number of readings required to obtained 13% as a limit of error for the entire group on a 95% reliability basis. (6) d) Calculate the additional number of readings required to obtained 13% as a limit of error for operator A activities on a 95% reliability basis. (4)