Victor Anderson, the owner of Anderson Belts Inc., is studying absenteeism among his employees. His workforce is small, consisting of only five employees. For the last 3 years, 2011 through 2013, he recorded the following number of employee absences, in days, for each quarter.

Determine a typical seasonal index for each of the four quarters.

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Quarter Year II II IV 2011 4 10 7 3 2012 5 12 9 4 2013 6 16 12 4