document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=117731>Question 117731</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please answer this question for me.\r<BR>\n" );
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document.write( "A random sample of 100 students who took a statistics exam were asked their score on the exam.  The mean score on the test was 50; the standard deviation was 10.  The scores are normally distributed.  \r<BR>\n" );
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document.write( "A) What percent of the students scored below 30?<BR>\n" );
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document.write( "B) What percent scored between 30 and 55?<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 #85706 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=85706\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A random sample of 100 students who took a statistics exam were asked their score on the exam. The mean score on the test was 50; the standard deviation was 10. The scores are normally distributed. <BR>\n" );
document.write( "A) What percent of the students scored below 30?<BR>\n" );
document.write( "Find the z-score for 30:<BR>\n" );
document.write( "z(30)=(30-50)/10 = -2<BR>\n" );
document.write( "Find P(z<-2) on your z-chart <BR>\n" );
document.write( "or use normalcdf(-10,-2) = 0.0228 on your <BR>\n" );
document.write( "TI calculator.<BR>\n" );
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document.write( "B) What percent scored between 30 and 55?<BR>\n" );
document.write( "Find the z=score for 55:<BR>\n" );
document.write( "z(55)=(55-50)/10 = 1/2<BR>\n" );
document.write( "Find P(-2<z<0.5) on your z-chart<BR>\n" );
document.write( "or use normalcdf(-2,0.5)= 0.6687<BR>\n" );
document.write( "no your TI calculator.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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