document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1201963>Question 1201963</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a certain book, the frequency distribution of the number of words per page may be taken as approximately normal with mean 800 and standard deviation 50. If three pages are chosen at random, what is the probability that none of them has between 830 and 845 words each? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #836568 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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/cgi-bin/show-face.mpl?user=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=836568\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> population mean is 800<BR>\n" );
document.write( "population standard deviation is 50<BR>\n" );
document.write( "sample size is 3<BR>\n" );
document.write( "since you are looking for the mean of a sample, use the standard error rather than the standard deviation.<BR>\n" );
document.write( "standard error = standard deviation / sqrt(sample size) = 50 / sqrt(3) = 28.86751346.<BR>\n" );
document.write( "probability that the number of words per page in the sample is not between 830 and 845 is equal to .9102<BR>\n" );
document.write( "here's what it looks like on a normal distribution calculator.<BR>\n" );
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document.write( " </SPAN>\n" );
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