A plant has a large number of similar machines. The machines breakdown randomly and the breakdowns are

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A plant has a large number of similar machines. The machines breakdown randomly and the breakdowns are independent of each other. Once a machine breaksdown, it has to be taken out of production till the time it is repaired. On the basis of the past data, the following distributions have been constructed.

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Each hour that a machine remains idle due to being, or waiting to be repaired, it costs the plant Rs 80 per hour by way of lost production. If a repairman is paid at Rs 8 per hour, how many repairmen should be hired by the company to service the machine breakdowns? For the purpose, simulate the system for a 50-hour period and use the following random numbers, reading row-wise starting with the NW corner.

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