document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=858129>Question 858129</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Consumer Reports rated airlines and found that 87% of the flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the on-time arrival rate is representative of the entire commercial airline industry, consider a random sample of 212 flights. (Round your answers to two decimal places.)\r<BR>\n" );
document.write( "\n" );
document.write( "What is the expected number that will arrive on time?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "What is the standard deviation of this distribution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #517089 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=517089\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Consumer Reports rated airlines and found that 87% of the flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). <BR>\n" );
document.write( "Assuming that the on-time arrival rate is representative of the entire commercial airline industry, <BR>\n" );
document.write( "consider a random sample of 212 flights. (Round your answers to two decimal places.) <BR>\n" );
document.write( "What is the expected number that will arrive on time?<BR>\n" );
document.write( "R(x) = np = 212*0.87 = 184.44<BR>\n" );
document.write( "--------------------------------------- \r<BR>\n" );
document.write( "\n" );
document.write( "What is the standard deviation of this distribution?<BR>\n" );
document.write( "std = sqrt(npq) = sqrt(184.44*0.13) = 4.90<BR>\n" );
document.write( "=============================================<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" );