document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=437210>Question 437210</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Household income does not tend to follow a normal distribution in a particular state, yet average income is approximately $45,000/year in this state, with a standard deviation of about $9000.  Within what income range would approximately 75% of the household incomes lie within this state?\r<BR>\n" );
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document.write( "having trouble forming the right way to put the information in an equation. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #302422 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=302422\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Household income does not tend to follow a normal distribution in a particular state, yet average income is approximately $45,000/year in this state, with a standard deviation of about $9000. Within what income range would approximately 75% of the household incomes lie within this state? <BR>\n" );
document.write( "having trouble forming the right way to put the information in an equation.<BR>\n" );
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document.write( "Draw the picture centering 75% on a mean of 45000<BR>\n" );
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document.write( "The lower limit will have a left-tail of 0.5000-(1/2)0.75 = 0.1250<BR>\n" );
document.write( "Find the z-value with a left-tail of 0.1250<BR>\n" );
document.write( "invNorm(0.1250) = -1.1503<BR>\n" );
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document.write( "Find the corresponding x-value:<BR>\n" );
document.write( "x = zs+u<BR>\n" );
document.write( "x = -1.1503*9000+45000 = $34646.86<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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