document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=744080>Question 744080</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Assume that the mean length of a human pregnancy is 268 days with a standard deviation of 9 days. What precentage of human pregnancies do we expect to last no more than 260 days? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #453174 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=453174\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Assume that the mean length of a human pregnancy is 268 days with a standard deviation of 9 days. What precentage of human pregnancies do we expect to last no more than 260 days?<BR>\n" );
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document.write( "z(260) = (260-268)/9 = -8/9<BR>\n" );
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document.write( "P(x <= 260) = P(z <= -8/9) = normalcdf(-100,-8/9) = 0.1870<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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