document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=441842>Question 441842</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Similar questions to this one were answered but I am not quite sure how to do this homework equation:\r<BR>\n" );
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document.write( "An urn contains 3 red and 2 white numbered balls. A sample of 2 balls is randomly chosen.<BR>\n" );
document.write( "15. Find the probability that the sample contains a red and a white ball (one digit after decimal point).<BR>\n" );
document.write( "16. Find the expected number of white balls in the sample (one digit after decimal point). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #304861 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=304861\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An urn contains 3 red and 2 white numbered balls. A sample of 2 balls is randomly chosen.<BR>\n" );
document.write( "15. Find the probability that the sample contains a red and a white ball (one digit after decimal point).<BR>\n" );
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document.write( "P(red/white) = 1 -{P(2red)+P(2white)]<BR>\n" );
document.write( "P(red/white) = 1 - [(3C2+2C2)/5C2] = 1 -[4/10] = 0.6<BR>\n" );
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document.write( "16. Find the expected number of white balls in the sample (one digit after decimal point).<BR>\n" );
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document.write( "P(no white) = 3C2/5C2 = 0.3<BR>\n" );
document.write( "P(1 white) = 0.6<BR>\n" );
document.write( "P(2 white) = 2C2/5C2 = 0.1<BR>\n" );
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document.write( "E(white) = 0*0.3 + 1*0.6 + 2*0.1 = 0.8 white balls<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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