document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=911727>Question 911727</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am stuck on this problem.  I believe it is a Z formula, but cannot find the formula to do a Z with a variable \"between\".  Here is the problem. \r<BR>\n" );
document.write( "\n" );
document.write( " A normally distributed variable with a mean of 16 minutes and a standard deviation of 4 minutes.  what is the probability that a random sample of 25 will yield a mean between 14 and 18 minutes inclusive? What formula did you use?<BR>\n" );
document.write( "Thanks to anyone that can help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #553294 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=553294\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If you are Using a TI<BR>\n" );
document.write( "P(14 &#8804; x &#8804; 18) = normalcdf(14,18,16,4)<BR>\n" );
document.write( "Re TY<BR>\n" );
document.write( "z1 = (14-16)/(4/sqrt(25)) = -10/4 = -2.5<BR>\n" );
document.write( "z2 = (18-16)/(4/sqrt(25) )= 10/4 = 2.5<BR>\n" );
document.write( "P(14 &#8804; x &#8804; 18) = P(z2) - P(z1)= .9938 - .0062<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );