document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=324820>Question 324820</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Please help me understand this question for my exam tomorrow. Find the z-score such that the interval within z standrard deviations of the mean for a normal distribution contains (A)50% of the probability and (B)90% of the probability. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #232559 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=232559\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the probabilities are symmetric about the mean (which has a z-score of 0)\r<BR>\n" );
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document.write( "for 50% , go into the z-score table and find the .25 area (probability)<BR>\n" );
document.write( "___ the associated z-score is above AND below the mean , giving a 50% interval\r<BR>\n" );
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document.write( "this may be helpful ___ http://www.mathsisfun.com/data/standard-normal-distribution-table.html </SPAN>\n" );
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