document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=630356>Question 630356</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If X is a normal random variable with standard deviation 3.50, and if the probability that X is more than 12.33 is .1271, then what is the mean of X? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #397008 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=397008\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If X is a normal random variable with standard deviation 3.50, and if the probability that X is more than 12.33 is .1271, then what is the mean of X?<BR>\n" );
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document.write( "P(x > 12.33) = 0.1271<BR>\n" );
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document.write( "Find the z-value with a right tail of 0.1271<BR>\n" );
document.write( "invNorm(1-0.1271) = 1.1402<BR>\n" );
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document.write( "Use z = (x-u)/s to find u.<BR>\n" );
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document.write( "1.1402 = (12.33-u)/3.50<BR>\n" );
document.write( "-u = (1.1402*3.50) - 12.33<BR>\n" );
document.write( "-u = -8.3393<BR>\n" );
document.write( "----<BR>\n" );
document.write( "u = 8.3393<BR>\n" );
document.write( "==========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=============== </SPAN>\n" );
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