document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1112279>Question 1112279</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A study on the delivery time of mail between two locations has found that the data follows a normal distribution. The study has also found that on average, mail takes up to five days to arrive with a standard deviation of 0:75 days. Using this information, what is the probability that the mail will take between four and six days to arrive? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #727300 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=727300\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z=(x-mean)/sd<BR>\n" );
document.write( "z(4)=(4-5)/0.75=(-1/.75)=-1.33<BR>\n" );
document.write( "z(6)=1/0.75=+1.33<BR>\n" );
document.write( "probability of z between these two is 0.8165 </SPAN>\n" );
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