Mr. DJ Catalog Ordering Company maintains an ordering staff of 30 telephone operators, who take orders from customers. Management wants to determine the proportion of time that operators are idle. A work sampling study was conducted at random over a 4-day period, and the following random observations were recorded: Observation Operators Idle Observation Operators 10/15: 1 6 11 4 2 5 10/17: 12 7 3 4 13 3 4 7 14 3 5 5 15 6 6 2 16 10/16: 7 4 17 7 8 3 18 4 9 5 10/19: 19 10 6 20