document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=912513>Question 912513</A>: <I><SPAN STYLE=\"word-break: break-all;\"> . In a certain Caribbean country, the average monthly income per <BR>\n" );
document.write( "family is US$5,600 with a standard deviation of US$3,200. If a <BR>\n" );
document.write( "random sample of 100 families is selected, calculate the probability <BR>\n" );
document.write( "that the sample mean monthly income is:\r<BR>\n" );
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document.write( "(a)between US$4,000 and US$6,000\r<BR>\n" );
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document.write( "(b) less than US$5000<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #553837 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=553837\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  m = 5600,  sd = 3200<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=z+=blue+%28x+-+mu%29%2Fblue%28sigma%2Fsqrt%28n%29%29 ALIGN=MIDDLE  ALT=\"z+=blue+%28x+-+mu%29%2Fblue%28sigma%2Fsqrt%28n%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a) P(4000 < x < 6000) = normalcdf(4000,6000,5600,320) Using TI<BR>\n" );
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document.write( "P(4000 < x < 6000) = P( z < 400/320) - P(z < -1400/320)<BR>\n" );
document.write( "b)P(x < 5000) = P(z < 600/320)<BR>\n" );
document.write( "compute z, use table etc to find Probability </SPAN>\n" );
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