document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=155365>Question 155365</A>: <I><SPAN STYLE=\"word-break: break-all;\"> So we have a normal distribution of test scores.   Mean score is 120; std deviation is 20.\r<BR>\n" );
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document.write( "  What is the z-value of a test score of 160??<BR>\n" );
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document.write( "What is the probability of selecting a test score from the group.... a test score between 120 and 160??\r<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 #114408 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=114408\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> So we have a normal distribution of test scores. <BR>\n" );
document.write( "Mean score is 120; std deviation is 20. <BR>\n" );
document.write( "What is the z-value of a test score of 160??<BR>\n" );
document.write( "z(160) = (160-120)/20 = 2<BR>\n" );
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document.write( "What is the probability of selecting a test score from the group.... a test score between 120 and 160?? <BR>\n" );
document.write( "z(120) = (120-120)/20 = 0<BR>\n" );
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document.write( "P(120 < x < 160) = P(0 < z < 2) = 0.4773<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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