document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=955025>Question 955025</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If X has a normal distribution with mean 80 and standard deviation 12, what is the distribution of the mean of a sample of 9 of these values?  Give the values of the parameters.\r<BR>\n" );
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document.write( "Please help me with this - \r<BR>\n" );
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document.write( "If X has a normal distribution with mean 80 and standard deviation 12, what is the distribution of the mean of a sample of 9 of these values?  Give the values of the parameters.\r<BR>\n" );
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document.write( "Please help me with this, I'm so confused.  Thank you.\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 #583350 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=583350\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If X has a normal distribution with mean 80 and standard deviation 12, what is the distribution of the mean of a sample of 9 of these values? Give the values of the parameters. <BR>\n" );
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document.write( "The Central Limit Theorem says:<BR>\n" );
document.write( "1. The mean of the sample means = the mean of the population.<BR>\n" );
document.write( "So your x-bar = u = 80<BR>\n" );
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document.write( "2. The std of the sample means = (std of population)/sqrt(sample size)<BR>\n" );
document.write( "So your sample std = 12/sqrt(9) = 12/3 = 4<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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