Secured maximum value from statistics? (5)

I believe the answer is:

bound

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'secured' is the definition.
(binding is a kind of securing)

I don't understand the rest of the clue.

(Other definitions for bound that I've seen before include "vault" , "long jump" , "fixed a > limit" , "border" , "Jump - certain - limit" .)

I've seen this clue in The Times.

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