document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1176102>Question 1176102</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The mean weight of trucks traveling on a particular highway road is not known. A highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weighting station and found the mean to be 14.9 tons, with a standard deviation of 4.1 tons. What is the probability that the average weight will be at most 13.4 tons? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #802422 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=802422\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> this is a t=(xbar-mean)/s/sqrt(n)<BR>\n" );
document.write( "t is df=48<BR>\n" );
document.write( "=(13.4-14.9)*sqrt(49)/4.1<BR>\n" );
document.write( "=-2.56<BR>\n" );
document.write( "probability t is < -2.56 given the df=48<BR>\n" );
document.write( "This is 0.0068<BR>\n" );
document.write( " </SPAN>\n" );
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