Taxes: The Internal Revenue Service reports that the mean federal income tax paid in the year 2010 was $8040. Assume that the standard deviation is $4700. The IRS plans to draw a sample of 1000 tax returns to study the effect of a new tax law. Part: 0 / 5 Part 1 of 5 (a) What is the probability that the sample mean tax is less than $80 ? Round the answer to at least four decimal places. The probability that the sample mean tax is less than $8000 is X Ś

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A: We have given that.   X~N( μ , ?^2 )   μ=2.9 , ? =1.3   Z-score =( x - μ )/?

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Q: Watch your cholesterol: The mean serum cholesterol level for U.S. adults was 198, with a standard…

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Q: Part 1 of 5 (a) What is the probability that the sample mean tax is less than $8200? Round the…

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