document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=629305>Question 629305</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2.	The average commute time via train from the Chicago O'Hare Airport to downtown is 60 minutes with a standard deviation of 15 minutes. Assume that the commute times are normally distributed. What proportion of commutes would be:<BR>\n" );
document.write( " c.	between 45 and 75 minutes?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #396166 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=396166\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The average commute time via train from the Chicago O'Hare Airport to downtown is 60 minutes with a standard deviation of 15 minutes. Assume that the commute times are normally distributed. What proportion of commutes would be:<BR>\n" );
document.write( "c. between 45 and 75 minutes? <BR>\n" );
document.write( "---------<BR>\n" );
document.write( "z(45) = (45-60)/15 = -1<BR>\n" );
document.write( "z(75) = (75-60)/15 = 1<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Prop(45 < x < 75) = P(-1< z < 1) = 0.68<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );