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 $4500 . The IRS plans to draw a sample of 1000 tax returns to study the effect of a new tax law. Part 1 of 5 (a) What is the probability that the sample mean tax is less than $7900 ? Round the answer to at least four decimal places. The probability that the sample mean tax is less than $7900 is .1626 . Alternate Answer: The probability that the sample mean tax is less than $7900 is 0.1626 . Part: 1 / 5 1 of 5 Parts Complete Part 2 of 5 (b) What is the probability that the sample mean tax is between $7400 and $8100 ? Round the answer to at least four decimal places. The probability that the sample mean tax is between $7400 and $8100 is