document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1128023>Question 1128023</A>: <I><SPAN STYLE=\"word-break: break-all;\"> About 12.5% of restaurant bills are incorrect. If 200 bills are selected at random, find the probability that at least 22 will contain an error.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #744537 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=744537\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The mean of this is 200*.125=25<BR>\n" );
document.write( "the variance is np(1-p)=25*.875=21.875<BR>\n" );
document.write( "sd is sqrt (variance)=4.68<BR>\n" );
document.write( "use normal approximation with mean 25 and sd 4.68<BR>\n" );
document.write( "continuity correction, use 21.5 to cover at least 22.<BR>\n" );
document.write( "z>=(21.5-25)/4.68<BR>\n" );
document.write( "z>-0.75 for probability 0.7734<BR>\n" );
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