document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1041478>Question 1041478</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A teacher is comparing test grades for a yearly test in her Algebra class. The <BR>\n" );
document.write( "mean of the scores is 78% and has a standard deviation of 3.8. Which range gives the set of values that are within two standard deviations of the mean?\r<BR>\n" );
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document.write( "A.) 74.2 - 81.8<BR>\n" );
document.write( "B.) 70.4 - 85.6<BR>\n" );
document.write( "C.) 74.2 - 85.6<BR>\n" );
document.write( "D.) 70.4 - 81.8<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 #656445 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=656445\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> mean = 0.78<BR>\n" );
document.write( "standard deviation = 0.038\r<BR>\n" );
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document.write( "lower bound = 0.78-2*0.038 = 0.704 = 70.4%<BR>\n" );
document.write( "upper bound = 0.78+2*0.038 = 0.856 = 85.6%\r<BR>\n" );
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document.write( "So the final answer is choice B<BR>\n" );
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