document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=694408>Question 694408</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a corporation's fleet of cars has an annual operating cost of $100,000. suppose the operating cost are normally distributed with a standard deviation of 100.<BR>\n" );
document.write( "a. what is the operating cost below which only 25% of the operating cost lies?<BR>\n" );
document.write( "b. what is the operating cost above which 55% of the operating costs lie?<BR>\n" );
document.write( "c. what is the operating cost would be more than 75% of operating cost? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #427877 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=427877\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a corporation's fleet of cars has an annual operating cost of $100,000. suppose the operating cost are normally distributed with a standard deviation of 100.<BR>\n" );
document.write( "a. what is the operating cost below which only 25% of the operating cost lies?<BR>\n" );
document.write( "Find the z-value with a left tail of 0.25:: invNorm(0.25) = -0.6745<BR>\n" );
document.write( "Solve for cost using x = z*s+u<BR>\n" );
document.write( "x = -0.6745*100+100,000<BR>\n" );
document.write( "x = $99932.55<BR>\n" );
document.write( "-------------------------------<BR>\n" );
document.write( "b. what is the operating cost above which 55% of the operating costs lie?<BR>\n" );
document.write( "Find the z-value with a left tail of 0.45:: invNorm(0.45) = -0.1257<BR>\n" );
document.write( "x = -0.1257*100+100,000<BR>\n" );
document.write( "x = $99987.43<BR>\n" );
document.write( "===================================<BR>\n" );
document.write( "c. what is the operating cost would be more than 75% of operating cost?<BR>\n" );
document.write( "I'll leave that to you.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=================<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );