document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1197596>Question 1197596</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that a pair of dice is tossed. One die has 9 sides, the other has 7 sides. What is the expected value of the sum of the two dice? (Don't write out the full probability model, add the two expected values.) \r<BR>\n" );
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document.write( "Obviously the question as posted can't be answered, because there is no information about what numbers are on the faces of each die....<br><BR>\n" );
document.write( "Assuming the numbers are the whole numbers from 1 to n for a die with n faces, the expected value for any roll on each die is (1+n)/2.<br><BR>\n" );
document.write( "Then the expected value on a roll of the 7-sided die is (1+7)/2 = 4 and the expected value on a roll of the 9-sided die is (1+9)/2 = 5; so the expected value of the sum of one roll on each die is 4+5 = 9.<br><BR>\n" );
document.write( "ANSWER: 9<br><BR>\n" );
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