document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=149928>Question 149928</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Here is the problem:\r<BR>\n" );
document.write( "\n" );
document.write( "Quality Control: <BR>\n" );
document.write( "Suppose that 10 computer chips are drawn from a box containing 12 good chips and 4 defective chips. What is the probability that<BR>\n" );
document.write( "a. exactly 4 of the chips are defective<BR>\n" );
document.write( "b. all 10 of the chips are good<BR>\n" );
document.write( "c. exactly 8 of the chips are good\r<BR>\n" );
document.write( "\n" );
document.write( "the answers are:<BR>\n" );
document.write( "a. 924/8008<BR>\n" );
document.write( "b. 66/8008<BR>\n" );
document.write( "c. 2970/8008\<BR>\n" );
document.write( "I tried using the nCr formula. I am sure this is the right one(not really sure or I would not be writing this) only i can't figure out which numbers to put where. <BR>\n" );
document.write( "this is what I did:<BR>\n" );
document.write( "working on a.<BR>\n" );
document.write( "10!/4!(10-4)! = came up with 210\r<BR>\n" );
document.write( "\n" );
document.write( "thanks in advance for any help.<BR>\n" );
document.write( "Heidi<BR>\n" );
document.write( "ps where do i find the thank you form. can't find it.<BR>\n" );
document.write( "  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #110029 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=110029\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose that 10 computer chips are drawn from a box containing 12 good chips and 4 defective chips.<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "These are binomial problems with p = 12/16 = 3/4, q = 1/4, n=10 <BR>\n" );
document.write( "What is the probability that<BR>\n" );
document.write( "a. P(exactly 4 of the chips are defective) = 10C4(3/4)^6(1/4)^4  <BR>\n" );
document.write( "-------------------------------------------------<BR>\n" );
document.write( "b. P(all 10 of the chips are good) = 10C10(3/4)^10(1/4)^0 <BR>\n" );
document.write( "------------------------------------------------<BR>\n" );
document.write( "c. P(exactly 8 of the chips are good) = 10C8(3/4)^8(1/4)^8 <BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "Comment: None of my answers agree with your posted answers.<BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
document.write( "\n" );
document.write( "the answers are:<BR>\n" );
document.write( "a. 924/8008<BR>\n" );
document.write( "b. 66/8008<BR>\n" );
document.write( "c. 2970/8008\<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );