The probability of a transformer that has been refurbished at a factory being defective is 0.12. An engineer wishes to buy 6 non-defective transformers from the factory. He will inspect transformers one by one until he gets 6 non-defective transformers. Suppose it takes just 10 minutes to inspect a non-defective transformer while the inspection of a defective transformer takes 1 hour. What is the standard deviation of the total time that the engineer will spend on inspections?

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