document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=516518>Question 516518</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 3. Approximately 20% of the independent grocery stores in Bonner County offer trading stamps. If a sample of 50 stores is selected, what is the probability that the proportion of stores offering trading stamps will be greater than 25%?\r<BR>\n" );
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document.write( "I need to know the correct formula for this problem  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #344516 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=344516\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Approximately 20% of the independent grocery stores in Bonner County offer trading stamps. If a sample of 50 stores is selected, what is the probability that the proportion of stores offering trading stamps will be greater than 25%? <BR>\n" );
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document.write( "25% of 50 = 12.5<BR>\n" );
document.write( "\"greater than 25% will be from 13 to 50 stores.<BR>\n" );
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document.write( "Binomial Problem with n = 50 and p = 0.20<BR>\n" );
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document.write( "P(13 <= x <= 50) = 1 - binomcdf(50,0.2,12) = 0.1861<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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