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which teacher exhibited the most variable year-to-year performance over this 5 year span?

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The Best Answer is which teacher exhibited the most variable year-to-year performance over this 5-year span?

The Correct Answer is Ed exhibited the most variable year-to-year performance over this 5-year span.

Explanation:

All of them has been consistence for at-least once. But, in case of Ed, throughout the time, his performance was in-consistence or variable.

Sam's performance was constant throughout 2008-09.

Ralph's performance was constant throughout 2006-07 and also in 2008-09.

Jill's performance was constant throughout 2005-07.

Tina's performance was constant throughout 2007-09
Most variable performance means varying performance or non-consistence performance.
As shown in the graph,
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