document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=879927>Question 879927</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A warning system installation consists of two independent alarms having probabilities of operating in an emergency of0.95 and 0.90 respectively. Find the probabilities that at least one alarm operates in an emergency<BR>\n" );
document.write( "A. 0.995<BR>\n" );
document.write( "B. 0.975<BR>\n" );
document.write( "C. 0.95<BR>\n" );
document.write( "D. 0.90<BR>\n" );
document.write( "E. 0.855 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #531156 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=531156\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2 Alarms: p(working) .95  and .90<BR>\n" );
document.write( "P(at least one working) = 1 - P(neither working) = 1 - (.05)(.10) = .995 </SPAN>\n" );
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