document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1135892>Question 1135892</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A random sample of n=100 observations is selected from a population with u=30 and sigma=25. \r<BR>\n" );
document.write( "\n" );
document.write( "P(X>28) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #753597 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=753597\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If I assume the population is normal the probability is a t df=99<BR>\n" );
document.write( "t=(x bar-mean)/s/sqrt(n)<BR>\n" );
document.write( ">=(28-30)/25/sqrt(100)<BR>\n" );
document.write( ">=-2*10/25=>-0.8<BR>\n" );
document.write( "This probability is 0.7872 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );