document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1079327>Question 1079327</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Internal Revenue Service is studying the category of charitable contributions. A sample of 30 returns is selected from young couples between the ages of 20 and 35 who had an adjusted gross income of more than $100,000. Of these 30 returns, 4 had charitable contributions of more than $1,000. Suppose 3 of these returns are selected for a comprehensive audit.\r<BR>\n" );
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document.write( "1.What is the probability exactly one of the three audited had a charitable deduction of more than $1,000? (Round your answer to 4 decimal places.)\r<BR>\n" );
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document.write( "2.What is the probability at least one of the audited returns had a charitable contribution of more than $1,000? (Round your answer to 4 decimal places.) </SPAN>\n" );
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document.write( "4/30*26/29*25/28*3, because the it could be 26/30*25/28*4/27 or 26/30*4/29*25/28--same results but they have to be added.<BR>\n" );
document.write( "0.3202<BR>\n" );
document.write( "or<BR>\n" );
document.write( "denominator 30C3=4060<BR>\n" );
document.write( "numerator 4C1*26C2=1300, and 1300/4060=0.3202.<BR>\n" );
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document.write( "At least 1: find 0 and subtract from 1. That would be 26/30/25/29*24/28=0.6404.<BR>\n" );
document.write( "So at least 1 is 1-0.6404=0.3596. </SPAN>\n" );
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