document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1081874>Question 1081874</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The average retail price of gasoline (all types) for the first half of 2005 was 212.2 cents. What would the standard deviation have to be in order for a 19% probability that a gallon of gas costs less than $1.80?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #695984 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=695984\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 19% probability or the 19th percentile is z=-0.88 from the table.<BR>\n" );
document.write( "-0.88=(1.80-2.122)/sd<BR>\n" );
document.write( "-0.88sd=-0.312<BR>\n" );
document.write( "sd=$0.355<BR>\n" );
document.write( "15.87% percentile is 1 sd, so this is just under 1 sd. </SPAN>\n" );
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