Answer:- Ed displayed the most variable year to year performance over this 5-year span.
Solution-
Most mutable performance means variable performance or non-consistence performance.
As revealed in the graph,
Jill’s performance was continuous throughout 2005-07.
Ralph’s performance was continuous throughout 2006-07 and likewise in 2008-09.
Tina’s performance was constant through 2007-09
Sam’s performance was constant through 2008-09.
All of them has been consistence for at-least once. But, in circumstance of Ed, through the time, his performance was in-consistence or variable.
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