Solve the following problem. be sure to show all steps (v. e.s. t.) and work in order to receive full credit.
the sum of three numbers is 26. the second number is twice the first and the third number is 6 more than the second.
find the numbers.
i
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1. 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. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?