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The average cost for new tires on a vehicle is $157.00. Assuming a normal distribution, if 70 percent of the costs for tires is less than $171.00,

The average cost for new tires on a vehicle is $157.00. Assuming a normal distribution, if 70 percent of the costs for tires is less than $171.00, what is the standard deviation? The answer is $25.92. How is this calculated?

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