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A work sampling study was performed on the day-shift maintenance department in a power generating station. The day-shift consists of five repair persons, each of whom works independently to repair equipment when it breaks down. A total of 1250 observations (250 observations per repair person) were taken during a five week period (200 total hours of station operation). The observations were classified into one of the following categories (1) maintenance person repairing equipment (2) maintenance person idle. There were a total of 940 observations in category 1. It is known that 750 equipment repairs were made during the 5 weeks. (a) How many more observations would be required, if any, to be 95% contident that the true proportion of category 1 activity is within 20.05 of the proportion indicated by the observations? observations (b) Determine average time it takes a repair person to repair a piece of broken-down equipment minutes (c) How many hours of idle time per week is experienced by each repair person, on average? hours s://e-learning qu.edujo/mod/quattempt.phplattempt 21976051015page 264