document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1175884>Question 1175884</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A study found that 61% of green turtles migrate to warmer climates when seasons change.  Scientists tagged 120 green turtles before migration.  What is the probability that less than 20 green turtles did not migrate to a warmer climate during the season change? \r<BR>\n" );
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document.write( "Mean:\r<BR>\n" );
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document.write( "Variance:\r<BR>\n" );
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document.write( "Standard Deviation: </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #801733 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=801733\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Normal approximation<BR>\n" );
document.write( "mean is np or 120*0.61=73.2 turtles migrate and 46.8 do not migrate <BR>\n" );
document.write( "variance is np(1-p) or 73.2*0.39=28.548 turtles^2<BR>\n" );
document.write( "sd is sqrt (V)=5.34 turtles <BR>\n" );
document.write( "probability is a z < (19.5-46.8)/5.34, using continuity correction factor<BR>\n" );
document.write( "and z < -5.34, which is essentially 0. </SPAN>\n" );
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