If we model after-tax household income by a normal distribution, then the figures of a 1995 study imply the information in the following table. Assume that the distribution of incomes in each country is bell-shaped and symmetric. Find the percent of canadian families which earned an after-tax income of $69,000 or more.
CountryU.S.CanadaSwitzerlandGermanySwedenMean Household Income$38,000$35,000$39,000$34,000$32,000Standard Deviation$21,000$17,000$16,000$14,000$11,000?
A. 5%
B. 95%
C. 47.5%
D. 2.5%
E. 99.7%
Answer: D
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