document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1143264>Question 1143264</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ricardo was conducting an experiment . if his experiment resulted with a success rate of 65% and a standard deviation of five ,at least how many trials did he conduct? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #764848 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=764848\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> np=mean<BR>\n" );
document.write( "np(1-p)=variance and sqrt(np(1-p)) is std dev.<BR>\n" );
document.write( "variance is 25<BR>\n" );
document.write( "n(0.65)(0.35)=25<BR>\n" );
document.write( ".2275n=25<BR>\n" );
document.write( "n=109.89 or 110. </SPAN>\n" );
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