Let x be the average number of employees in a group health insurance plan, and let y be the average administrative cost as a percentage of claims. x 3 7 15 34 76 y 40 40 34 37 34 28 17 Use a calculator to verify that x = 135, Σχ' = 7,215, Ex=156, Σγ = 5,198, and Exy 3,133. Computer. (Round your answer to four decimal places.) r =

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