document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1147825>Question 1147825</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 5.2/21 The probability of a randomly selected adult in one country being infected with a certain virus is 0.005. In tests for the​ virus, blood samples from 28 people are combined. What is the probability that the combined sample tests positive for the​ virus? Is it unlikely for such a combined sample to test​ positive? Note that the combined sample tests positive if at least one person has the virus. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #769172 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=769172\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is the same as 1- probability that NONE has the virus.<BR>\n" );
document.write( "that is 1-0.995^27 or 0.1265\r<BR>\n" );
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document.write( "It is not at all unlikely that the combined sample may test positive. </SPAN>\n" );
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