Business Travel News reported that the average per diem total for a business traveler in Paris, France is $608. Suppose the shape of the distribution of the per diem costs of a business traveler to Paris is unknown, but that 50% of the per diem figures are between $ 578 and $ 638. What is the value of the standard deviation? (Round the intermediate values to 3 decimal places. Round your answers to 2 decimal places.) Standard deviation =

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