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[See Solution] For the normal distribution described in exercise 7.12, what tax preparation fee would have been exceeded by 90% of the tax preparation customers?

Question: For the normal distribution described in exercise 7.12, what tax preparation fee would have been exceeded by 90% of the tax preparation customers?

(Exercise 7.12 summary: In 1999, the average charge for tax preparation by H&R was $84.57 with a normal distribution and standard deviation of σ = $10)

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[See Solution] For the normal distribution described in exercise 7.12, what tax preparation fee would have been exceeded by 90% of the tax preparation customers?

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