A party challenging an expert determination as not made in accordance with the contract must establish departure on the balance of probabilities by satisfactory inference, not mere conjecture. A near-coincidence between the determined figure and a figure derivable from part of the materials before the expert is insufficient where multiple considerations make it inherently improbable the expert acted in the manner suggested. A party that deliberately abandoned a challenge to the validity of an expert determination agreement at trial will not be permitted to raise it on appeal.
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