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The average cost of an IRS Form 1040 tax filing at Thetis Tax Service is $143.00.Assuming a normal distribution, if 77 percent of the filings

The average cost of an IRS Form 1040 tax filing at Thetis Tax Service is $143.00.Assuming a normal distribution, if 77 percent of the filings cost less than $155.00, what is the standard deviation?Hint:Use Excel or Appendix C-2 to find thez-score.(Round your answer to 2 decimal places.)

Standard deviation

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