Consider the ages (in years) and maintenance costs (in thousands of dollars per year) for five similar

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Consider the ages (in years) and maintenance costs (in thousands of dollars per year) for five similar printing presses (Table 5.5.12).
a. Calculate the average age of the presses.
b. Calculate the standard deviation of the ages of the presses.
c. Calculate the range of the ages of the presses.
d. Calculate the coefficient of variation of the ages of the presses.
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