document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1136238>Question 1136238</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 2005, 74% of all airline flights were on-time. If we choose a simple random sample of 2000 flights, find the probability that (be as accurate as the proper process allows)<BR>\n" );
document.write( "(a) at least 77% of the sample's flights were on time:  <BR>\n" );
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document.write( "(b) at most 1420 of the sample's flights were on time: </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #754008 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=754008\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z value is (0.77-0.74)/sqrt(0.74*0.26/2000)<BR>\n" );
document.write( "z>3.06 p=0.0022\r<BR>\n" );
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document.write( "1420 is 0.71<BR>\n" );
document.write( "this is the same probability <BR>\n" );
document.write( "z<-3.06 </SPAN>\n" );
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