a. The coefficient of variation, expressed as a percent, is used to describe the standard deviation relative to the mean. It allows us to compare variability of data sets with different measurement units (such as centimeters versus kilograms), and it is calculated as follows:

Find the coefficient of variation (C.V.) for the following two samples:
Sample A (Service in years of 10 employees):
10 35 40 12 15 11 17 16 15 25
Sample B (Number of new cars sold at a dealership over 7 days): 8 5 12 3 0 6 3
b. Genichi Taguchi developed a method of improving quality and reducing manufacturing costs through a combination of engineering and statistics. A key tool in the Taguchi method is the signal-to-noise ratio. The simplest way to calculate this ratio is to divide the mean by the standard deviation. Find the signal-to-noise ratio for the sample data given in part (a).

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. 100 or100