document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=131110>Question 131110</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This is not a textbook question.<BR>\n" );
document.write( "A medication is 75% effective against a bacterial infection.  Find the probability that if 12 people take the medication, at least one person's infection will not improve.\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you :) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #95742 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=95742\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A medication is 75% effective against a bacterial infection. <BR>\n" );
document.write( "P(effective) = 0.75 ; P(not effective) = 0.25<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "Find the probability that if 12 people take the medication, at least one person's infection will not improve:<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "P(at least one not effective) = 1 - P(none are not effective)<BR>\n" );
document.write( "= 1- P(all are effective) = 1 - (0.75)^12 = 0.968...<BR>\n" );
document.write( "===============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );