document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1143865>Question 1143865</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The amount of money that students spend on their cell phones per week is normally distributed with a mean of $52-00 and a standard deviation of $6-00.  What is the probability that a student studies for more than $60-00  per week. Find the probability that the mean amount of money on cell phones for three randomly selected students is less than $60-66 per week  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #764823 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=764823\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> z=(x-mean)/sd<BR>\n" );
document.write( "z>(60-52)/6 or z>1.33<BR>\n" );
document.write( "probability is 0.9176\r<BR>\n" );
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document.write( "if this is 60.66<BR>\n" );
document.write( "then z<(x bar-60)/6/sqrt(3)<BR>\n" );
document.write( "This is z<(0.66)*sqrt(3)/6 or z<0.19 with probability 0.5753 </SPAN>\n" );
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