ABS Specializes in Repair and Maintenance of Industrial Machines

question 47

Multiple Choice

ABS specializes in repair and maintenance of industrial machines.One repair technician has been assigned to five identical grinding machines for repair and maintenance.The machine breaks down after about 20 hours of use,and breakdowns have a Poisson probability distribution.It takes 6 hours to repair a machine,and repair times follow an exponential distribution.Machine downtime costs the company $250 an hour,and the technician is paid $50 an hour.Determine the average number of machines working.

• A)3.59
• B)2.87
• C)3.43
• D)2.54

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Definitions:

Joint

A structure in the body where two or more bones are connected, allowing for movement and support.

Movement

The act or process of moving or changing place or position.

Angle

A geometric figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.

Synarthrosis

A type of joint that is immovable, typically found in the skull.