document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=828141>Question 828141</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The average length of stay in a chronic disease hospital for a certain type of patient is 60 days with a standard deviation of 15.  Suppose it is reasonable to assume an approximately normal distribution of lengths of stay.<BR>\n" );
document.write( "a. what percentage of patients stay less than 50 days?  \r<BR>\n" );
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document.write( "I don't even know how to start.  I know that 60 is the mean and obviously the standard deviation is 15 but I don't know what to do with this data.<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 #499079 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=499079\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The average length of stay in a chronic disease hospital for a certain type of patient is 60 days with a standard deviation of 15. Suppose it is reasonable to assume an approximately normal distribution of lengths of stay.<BR>\n" );
document.write( "a. what percentage of patients stay less than 50 days? <BR>\n" );
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document.write( "z(50) = (50-60)/15 = -10/15 = -2/3<BR>\n" );
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document.write( "P(x < 50) = P(z < -2/3) = 0.2525 = 25.25%<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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