document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=886947>Question 886947</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have to create a Joint Probability Table for the following, and then answer questions below.   But, I don't know which numbers to add together to get the probability percentages to go on the Joint Probability Table.  How do I calculate the percentages?  \r<BR>\n" );
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document.write( "GRADE------YES------NO------TOTAL\r<BR>\n" );
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document.write( "3----------56-------12-------68<BR>\n" );
document.write( "4----------65--------7-------72<BR>\n" );
document.write( "5----------52--------8-------60\r<BR>\n" );
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document.write( "Totals----173-------27------200\r<BR>\n" );
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document.write( "If the child is in 3rd grade, what is possibility they passed the exam?<BR>\n" );
document.write( "(Is the answer 56/200 = .38?  That is what I calculated.\r<BR>\n" );
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document.write( "If the child passed the exam, what is the probability they are in the 3rd grade?  (got 56/173 = .32.  Is that right?)    Please help and Thank you!!<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #536247 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=536247\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If the child is in 3rd grade, then probability that the child passed is<BR>\n" );
document.write( "Pr = 56/68 = 0.82<BR>\n" );
document.write( "If the child passed the exam, what is the probability they are in the 3rd grade? <BR>\n" );
document.write( "Pr = 56/173 = 0.32<BR>\n" );
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