On November 17, 1991, the Home News used the information in this figure to show that the US Congress taxes foreigners at lower rates than it taxes American citizens.

(a) Calculate the mean and standard deviation of the tax rates for the 16 foreign countries.

(b) Calculate the Z scores for the 16 foreign countries and then draw related conclusions.

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6.06 5.63 5.21 Foreign investors get big tax breaks on money made in the U.S. 1988 tax rates, in percent. 4.64 4.39 4.39 3.95 3.67 Rate for middle- income* U.S. 2.50 2.24 *$30,000 to $40,000 1.97 1.86 taxpayers: 10.7% 1.29 1.02 .76 .14 Japan Cayman Islands Spain Great Britain Canada France Italy Netherlands Saudi Arabia Belgium Kuwait Neth. Antilles Taiwan Singapore Finland United Arab Emirates