document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=719387>Question 719387</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The J.O. Supply Company buys calculators from a Korean supplier.  The probability of a defective calculator is 10%.  100 calculators are selected at random.  What is the expected number of defectives?  What is the standard deviation?  What is the probability that 3 or more calculators will be defective? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #441335 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=441335\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The J.O. Supply Company buys calculators from a Korean supplier. <BR>\n" );
document.write( "The probability of a defective calculator is 10%. <BR>\n" );
document.write( "100 calculators are selected at random. <BR>\n" );
document.write( "What is the expected number of defectives?<BR>\n" );
document.write( "E(x) = np = 100*0.10 = 10<BR>\n" );
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document.write( "What is the standard deviation? <BR>\n" );
document.write( "std = sqrt(npq) = sqrt(10*0.9) = 3<BR>\n" );
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document.write( "What is the probability that 3 or more calculators will be defective?<BR>\n" );
document.write( "P(3 or more) = 1 - P(0<= x <=2) = 1 - binomcdf(100,0.1,2) = 0.9900\r<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
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