document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1081883>Question 1081883</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A mail order company has a 6% success rate. If it mails advertisements to 570 people, find the probability of getting less than 28 sales. Round z value calculations to 2 decimal places and final answer to 4 decimal places.\r<BR>\n" );
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document.write( " P (X < 28) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #695973 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=695973\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Normal approximation<BR>\n" );
document.write( "mean is np=34.2<BR>\n" );
document.write( "variance is np(1-p)=34.2*.94=32.148<BR>\n" );
document.write( "sd is sqrt (V)=5.67<BR>\n" );
document.write( "for x <28, using 27.5<BR>\n" );
document.write( "z<(27.5-34.2)/5.67<BR>\n" );
document.write( "z<-6.7/5.67=-1.18<BR>\n" );
document.write( "That probability is 0.1190.\r<BR>\n" );
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