According to the internal revenue service the mean tax

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Reference no: EM13627098

According to the Internal Revenue Service, the mean tax refund for the year 2007 was $2,708. Assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution

What range of values would account for virtually all (99.73%) of the tax refunds?
What percent of the refunds are more than $3,000
What percent of the refunds are more than $3,000 but less than $3,500?
What percent of the refunds are more than $2,500 but less than $ 3,500?
What percent of the refunds are less than $ 3,000?
What amount of tax refund will account for 90 percent of the returns?
the returns?

Reference no: EM13627098

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