An orthodontist group has three financing packages, and each has a different service charge. He estimates that about 35% of the patients use the first plan which has a service charge of $100; 33% use the second plan which has a service charge of $200, and remaining use the third plan which has a service charge of $300. The standard deviation of the service charge, in dollars, is: 81.8 77.05 6691 5943.45

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