The internal revenue service reports that the mean federal income tax paid in the year 2010 was $8040. Assume that the standard deviation is $4600. The IRS plans to draw a sample of 100 tax returns to study the effect of a new law. Part 4. Would it be unusual if the sample mean we're less than $7500? Round your answer to four decimals place. Part 5. Do you think it would be unusual for an individual to pay tax of less than $7500! Explain ? Assume the population is approximately normal.

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A: According to our guidelines, we can answer only three sub-parts. So, please repost the rest parts.

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