document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1161601>Question 1161601</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The average individual monthly spending in<BR>\n" );
document.write( "the United States for paging and messaging services<BR>\n" );
document.write( "is $10.15. If the standard deviation is $2.45 and the<BR>\n" );
document.write( "amounts are normally distributed, what is the<BR>\n" );
document.write( "probability that a randomly selected user of these<BR>\n" );
document.write( "services pays more than $15.00 per month? Between<BR>\n" );
document.write( "$12.00 and $14.00 per month? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #787510 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=787510\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z=(x-mean)/sd<BR>\n" );
document.write( "z=(15-10.15)/2.45=1.978<BR>\n" );
document.write( "probability z> 1.978 is 0.0239<BR>\n" );
document.write( "between 12 and 14 <BR>\n" );
document.write( "do it the same way or on calculator 2nd VARS2 normal cdf ENTER (12,14,10.15,2.45)ENTER<BR>\n" );
document.write( "0.1671<BR>\n" );
document.write( "it is probability z is between 0.755 and 1.571 (0.1670), the difference in the last decimal place was that I was rounding in the second. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );