The Average Time Before Breakdown of a Machine Is Normally

question 25

Multiple Choice

The average time before breakdown of a machine is normally distributed and has a mean of 18 weeks and a standard deviation of three weeks. If breakdown cost averages $2,000 and preventive maintenance costs $1,400, what is the optimal preventive maintenance interval?

• A)16.4 weeks
• B)14.6 weeks
• C)16.9 weeks
• D)19.6 weeks
• E)21.3 weeks

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Definitions:

Hemodialysis

A medical treatment for kidney failure that involves filtering waste and excess fluids from the blood using a dialysis machine.

Prefix Dia-

A prefix in medical terminology meaning across, through, or completely, used in various terms such as diagnosis (understanding a condition through thorough examination).

Structure

The arrangement or organization of parts to form an object, system, or concept.

Urine

A liquid waste product produced by the kidneys that is excreted by the body through the process of urination.