document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=748390>Question 748390</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm pretty good at probability, but can't figure this problem out. I can't find my notes and am reviewing for an exam!<BR>\n" );
document.write( " \"If a teacher has a box of 10 expo markers and only half of them work, what is the probability that at least one of 3 randomly selected markers works?\" </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #455484 by </B><A HREF=/tutors/aboutme.mpl?userid=MathTherapy><B>MathTherapy(10552)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathTherapy><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=MathTherapy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=455484\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "I'm pretty good at probability, but can't figure this problem out. I can't find my notes and am reviewing for an exam!<BR>\n" );
document.write( " \"If a teacher has a box of 10 expo markers and only half of them work, what is the probability that at least one of 3 randomly selected markers works?\"\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Binomial probability formula: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=_%5Bn%5DC%5Bs%5D+%2A+p%5Es+%2A+q%5E%28n-s%29 ALIGN=MIDDLE  ALT=\"_%5Bn%5DC%5Bs%5D+%2A+p%5Es+%2A+q%5E%28n-s%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >    \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "At least 1 of 3 means either 1, 2, or 3 will work, or P(1, 2, or 3), or P(1) + P(2), or P(3)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "P(1) = 0.010\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "P(2) = 0.044\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "P(3) = 0.117 \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Probability that at least 1 of 3 will work = P(1) + P(2) + P(3), or 0.010 + 0.044 + 0.117, or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28.171%29 ALIGN=MIDDLE  ALT=\"highlight_green%28.171%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%2817.1%29 ALIGN=MIDDLE  ALT=\"highlight_green%2817.1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >%. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );