document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=375569>Question 375569</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Assume that systolic blood pressure readings are normally distributed with a mean of 122 and a standard deviation of 9.6.  If 144 individuals are selcted at random, determine the probability that the mean (systolic) blood pressure of these individuals will be less than 124.\r<BR>\n" );
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document.write( "I don't know where to begin! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #267085 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=267085\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The sampling distribution of the means would also be normally distributed with a <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=mu+=+122 ALIGN=MIDDLE  ALT=\"mu+=+122\"   DISABLED_style= \"max-width:90%; height:auto;\" > and standard deviation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sigma%2Fsqrt%28n%29+=+9.6%2Fsqrt%28144%29+=+9.6%2F12+=+0.8 ALIGN=MIDDLE  ALT=\"sigma%2Fsqrt%28n%29+=+9.6%2Fsqrt%28144%29+=+9.6%2F12+=+0.8\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  Then <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%28X+%3C+124%29+=+P%28%28X+-+mu%29%2F%28sigma%2Fsqrt%28n%29%29+%3C+%28124+-+mu%29%2F%28sigma%2Fsqrt%28n%29%29%29+ ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%28Z+%3C+%28124+-+122%29%2F0.8%29+=+P%28Z+%3C+2.5%29 ALIGN=MIDDLE  ALT=\"P%28Z+%3C+%28124+-+122%29%2F0.8%29+=+P%28Z+%3C+2.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  You can easily get the probability now by looking at a usual standard normal table. </SPAN>\n" );
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