document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=545779>Question 545779</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The accompanying table shows the percentages of residents in a large community when classified according to gender and presence of a particular allergy.<BR>\n" );
document.write( "---------Allergy<BR>\n" );
document.write( "------Present-----Absent<BR>\n" );
document.write( "Male----15----------36\r<BR>\n" );
document.write( "\n" );
document.write( "Female--40----------39\r<BR>\n" );
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document.write( "Suppose that the selection of a person is considered a trial and the presence of the allergy is considered a success. For each case, identify the numerical value of p and find the required probability.\r<BR>\n" );
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document.write( "Two males and two females are selected at random. What is the probability that none has the allergy?\r<BR>\n" );
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document.write( "This problem is going to due soon. Please help me solve this problem ASAP. Thank you so much for your effort. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #355746 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=355746\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The accompanying table shows the percentages of residents in a large community when classified according to gender and presence of a particular allergy.<BR>\n" );
document.write( "---------Allergy<BR>\n" );
document.write( "------Present-----Absent-----Total<BR>\n" );
document.write( "Male----15----------36-------51\r<BR>\n" );
document.write( "\n" );
document.write( "Female--40----------39-------79<BR>\n" );
document.write( "Total---55----------75-------130\r<BR>\n" );
document.write( "\n" );
document.write( "Suppose that the selection of a person is considered a trial and the presence of the allergy is considered a success. For each case, identify the numerical value of p and find the required probability.\r<BR>\n" );
document.write( "\n" );
document.write( "Two males and two females are selected at random. What is the probability that none has the allergy?<BR>\n" );
document.write( "P(2 males absent) = 15C2/51C2 = 0.0824<BR>\n" );
document.write( "P(2 females absent) = 40C2/79C2 = 0.2532<BR>\n" );
document.write( "----<BR>\n" );
document.write( "P(2males AND 2females absent) = 0.0824*0.26532 = 0.0209<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );