Question: An operator has four machines assigned to her. Each machine tends to run about 75% of the time and to require operator interaction at irregular

An operator has four machines assigned to her.

An operator has four machines assigned to her. Each machine tends to run about 75% of the time and to require operator interaction at irregular intervals on average about 25% of the time. 3.17 hours of machine time will be lost each day due to the interference. Assume that the work day is 10 hours long. What proportion of machine time will be lost each day, on average, due to interference? A. 7.93% B. 8.66% C. 7.21% D. 6.28%

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