document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=993636>Question 993636</A>: <I><SPAN STYLE=\"word-break: break-all;\"> for a normal distribution problem, I know the formula to find a z-score includes the known standard deviation---but how do I solve for finding a standard deviation if my only known numbers are the z-score and the number it corresponds to? I.E. A score that is 12 points above the mean corresponds to a z-score of 2. What is the standard deviation? I took 12/2=6. solving 6 as my standard deviation but not sure if correct formula<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 #612860 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=612860\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A score that is 12 points above the mean corresponds to a z-score of 2. What is the standard deviation? I took 12/2=6. solving 6 as my standard deviation but not sure if correct formula<BR>\n" );
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document.write( "You are correct.<BR>\n" );
document.write( "If a number has a z-score of 2 that means the number is<BR>\n" );
document.write( "2 standard deviations to the right of the mean.<BR>\n" );
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document.write( "If the mean is zero, and 12 is 2 std to the right,<BR>\n" );
document.write( "the std must be 12/2 = 6.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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