A Crew of Mechanics at the Department of Transportation Garage

question 40

Multiple Choice

A crew of mechanics at the Department of Transportation garage make minor repairs to snowplows during the winter. The snowplows break down at an average rate of 4 vehicles per day and breakdowns are distributed according to the Poisson distribution. The mechanic can service an average of 7 vehicles per day with a repair time distribution that approximates a negative exponential distribution. Assume an 8 hour day.
-Determine the average time that a snowplow is out of service.

• A) .33 hours
• B) 20 minutes
• C) 2.64 hours
• D).19 days

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Definitions:

Outermost Layer

The outermost layer refers to the surface or external layer of an object or body, which is directly exposed to the environment.

Iliac Crest

The curved upper border of the ilium, the largest bone of the pelvis, important as a landmark for various surgical and clinical procedures.

Quadratus Lumborum

A muscle in the lower back on either side of the lumbar spine that helps in bending the trunk sideways.

Vertebral Column

The flexible and strong spine consisting of a series of vertebrae, extending from the skull to the small of the back, providing support and forming the central part of the skeleton.