document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1150405>Question 1150405</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the average retail price of gasoline (all types) for 2014 was $3.42 cents. what would the standard deviation have to be in order for there to be a 15% probability that a gallon cost less than $3.00?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #772704 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=772704\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z=(x-mean)/sd<BR>\n" );
document.write( "z=-1.04 for 15th percentile<BR>\n" );
document.write( "-1.04=(3.00-3.42)/sd<BR>\n" );
document.write( "-1.04 sd=-0.42<BR>\n" );
document.write( "sd=$0.40 or 40 cents </SPAN>\n" );
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