document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1000028>Question 1000028</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Psychologists estimate that 80% of male drivers, when lost in trying to find<BR>\n" );
document.write( "a location, continue to drive rather than asking for directions. If this<BR>\n" );
document.write( "estimate is correct, what is the probability that, in a random sample of 100<BR>\n" );
document.write( "lost male drivers, the proportion who continue to drive is<BR>\n" );
document.write( "a. at least 0.70?<BR>\n" );
document.write( " b. less than 0.85?<BR>\n" );
document.write( "I just want which formula I should use . please tell me step by step not shortcut method . great thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #617529 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=617529\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  Psychologists estimate that 80% of male drivers, when lost in trying to find<BR>\n" );
document.write( "a location, continue to drive rather than asking for directions. If this<BR>\n" );
document.write( "estimate is correct, what is the probability that, in a random sample of 100<BR>\n" );
document.write( "lost male drivers, the proportion who continue to drive is<BR>\n" );
document.write( "Binomial Problem:: n = 100, P(lost driver drives) = 0.8<BR>\n" );
document.write( "======================<BR>\n" );
document.write( "a. at least 0.70?<BR>\n" );
document.write( "P(70<= x <=100) = 1 - binomcdf(100,0.8,69) = 0.0061 <BR>\n" );
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document.write( "b. less than 0.85?<BR>\n" );
document.write( "P(0<= x <=85) = binomcdf(100,0.8,85) = 0.9196<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "--------------------- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );