Engineering Economy 7th Edition by Leland Blank ,Anthony Tarquin

Exercise 55

The following annual maintenance and operation (M O) costs for a piece of equipment were collected over a 5-year period: $12,300, $8900, $9200, $11,000, and $12,100. The average is $10,700. In conducting a sensitivity analysis, the most reasonable range of costs to use (i.e., percent from the average) is:
A) ±5% b) ±11% c) ±17% d) ±25%