document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=823120>Question 823120</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The class average on a test was 81, with a standard deviation of 2.6. Find the probability that a student received at least a 78 on the test.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #495268 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=495268\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The class average on a test was 81, with a standard deviation of 2.6. Find the probability that a student received at least a 78 on the test. <BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "z(78) = (78-81)/2.6 = -3/2.6 = -1.1538<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "P(x >= 78) = P(z >= -1.1538) = normalcdf(-1.1538,100) = 0.8757<BR>\n" );
document.write( "===============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=============== </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );