document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=363430>Question 363430</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In Texas 75% of all drivers wear their seat belts.\r<BR>\n" );
document.write( "\n" );
document.write( "A) Out of 160 drivers, what is the expected number who are wearing their seat belts?\r<BR>\n" );
document.write( "\n" );
document.write( "B) How many drivers will need to be observed in order to be 99.5% certain of observing more than two wearing their seat belts?\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you in advance. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #259153 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=259153\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A)<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.75%2A160=120 ALIGN=MIDDLE  ALT=\"0.75%2A160=120\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "B)We have to solve the equation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1-0.25%5En+-+n%2A%280.75%29%2A0.25%5E%28n-1%29+-+%28%28n%28n-1%29%29%2F2%29%2A%280.75%5E2%29%2A0.25%5E%28n-2%29+=+0.995 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >.  The closest value of n that would work for this is n = 8:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1-0.25%5E8+-+8%2A%280.75%29%2A0.25%5E7+-+%28%288%287%29%29%2F2%29%2A%280.75%5E2%29%2A0.25%5E6+=+0.99577 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );