The IRS reports that the mean refund for a particular group of tax payers was $1,600. The distribution of tax refunds follows a normal distribution
The IRS reports that the mean refund for a particular group of tax payers was $1,600. The distribution of tax refunds follows a normal distribution with a standard deviation of $850.
a. What percentage of the refunds are between $1,600 and $2,000?
b. What percentage of the refunds are between $900 and $2,000?
c. What percentage of the refunds are between $1,800 and $2,000?
d. Ninety-five percent of the refunds are for less than what amount?
Step by Step Solution
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Step: 1
a The statistic x 1600 850 is standard normal where x is the tax refund amount Thus the ...
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Authors: R. Lyman Ott, Micheal T. Longnecker
7th Edition
1305269470, 978-1305465527, 1305465520, 978-1305269477
