document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=381448>Question 381448</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A continuous random variable X follows the t-distribution with 120 degree of freedom.\r<BR>\n" );
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document.write( "1) Find P(X>1.980)<BR>\n" );
document.write( "2) Find P(X<-1.289)<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 #270558 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=270558\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Just a suggestion:  With a degree of freedom this big, you can already replace the t-distribution with the z-distribution.  (The graphs of the density functions are almost identical!)  So P(X>1.980) = P(Z>1.980), and P(X<-1.289)= P(Z < -1.289).  Try it! </SPAN>\n" );
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