A college professor collected data on the number of hours spent by his 100 students over the weekend to prepare for Monday's Business Statistics exam.He processed the data by Excel and the following incomplete output is available. 
The coefficient of variation in the data is ______.
Definitions:
Final Value
The value of an investment at the end of a specified period, taking into account factors like principal, interest rate, and time.
Percent Change
The proportionate change in a value over time, represented as a percentage, to indicate increase or decrease.
Initial Value
The starting value or condition from which progress or decay is measured.
Subdivision
The act of dividing something, such as land or an organization, into smaller parts or sections.
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