document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=929393>Question 929393</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The wait time for a company before a customer can talk to a customer service representative has a mean of 140 seconds with a standard deviation of 20 seconds. Suppose the distribution of wait times is approximately bell-shaped and symmetric.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "What is the approximate proportion of customers who wait time is under 100 seconds?<BR>\n" );
document.write( "	\r<BR>\n" );
document.write( "\n" );
document.write( "		A		16%<BR>\n" );
document.write( "		B		32%<BR>\n" );
document.write( "		C		5%<BR>\n" );
document.write( "		D		2.5%<BR>\n" );
document.write( "		E		97.5% </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #564251 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=564251\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean = 140 seconds, SD =  20 seconds, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=z+=+blue%28x+-+140%29%2Fblue%2820%29 ALIGN=MIDDLE  ALT=\"z+=+blue%28x+-+140%29%2Fblue%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >  <BR>\n" );
document.write( "p(x < 100) = p(z < -40/20) = normalcdf(-100, -2) = .0228 = 2.28%<BR>\n" );
document.write( "D the closest   </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );