document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1120867>Question 1120867</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 9.	A normal distribution of utility bills shows the mean to be $100 and the standard deviation of $12.\r<BR>\n" );
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document.write( "a)	What percent of the utility bills are more than $125.<BR>\n" );
document.write( "b)	If 300 utility bills are randomly selected, about how many of them would you expect to be less than $90?<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 #736613 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=736613\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z=(x-mean)/sd or 25/12 or +2.167<BR>\n" );
document.write( "probability z>2.17 is 0.0150<BR>\n" );
document.write( "for 300 bills, this would be 300*0.015 or 4.5.  Four or five bills. </SPAN>\n" );
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