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
Correct Answer:
Verified
Correct Answer:
Verified
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