document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1187347>Question 1187347</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The length of time it takes to fill an order at a local sandwich shop is normally distributed with a mean of 4.1 minutes and a standard deviation of 1.3 minutes. The probability is 80% that the waiting time is greater than how long?\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #818333 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=818333\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> you want the 20th percentile <BR>\n" );
document.write( "invnorm function shows the z for that as -0.8416.<BR>\n" );
document.write( "z=(x-mean)/sd<BR>\n" );
document.write( "-0.84=(x-4.1)/1.3<BR>\n" );
document.write( "-1.09=x-4.1<BR>\n" );
document.write( "x=3 minutes. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );