document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1155690>Question 1155690</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose the age at death for politicians can be modeled by an approximately normal distribution with a mean of 72.7 years and a standard deviation of 7.2 years.\r<BR>\n" );
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document.write( "Calculate the z-score representing the longest 20% of life expectancy for politicians. (Round your answer to two decimal places.)\r<BR>\n" );
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document.write( "Calculate the value (in years) representing the top 20% of life expectancies. (Round your answer to one decimal place.) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #778469 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=778469\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The z-score =(x-mean)/sd<BR>\n" );
document.write( "z(.20)=-0.842 so upper 20% is z=+0.84 (z (.80))<BR>\n" );
document.write( "z=(x-mean)/sd<BR>\n" );
document.write( ".84=(x-72.7)/7.2<BR>\n" );
document.write( "6.05=x-72.7<BR>\n" );
document.write( "x=78.75 or 78.8 years </SPAN>\n" );
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