document.write( "Question 1148222: A bag contains 2 gold marbles, 10 silver marbles, and 30 black marbles. Someone offers to play this game: You randomly select one marble from the bag. If it is gold, you win $3. If it is silver, you win $2. If it is black, you lose $1.
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Algebra.Com's Answer #769575 by ikleyn(52817) $\"\"$ $\"About$

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document.write( "Note that the total number of marbles in the box is  2+10+30 = 42 originally.\r\n" );
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document.write( "The Math expectation of the win value is\r\n" );
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document.write( "     =  =  =   of a dollar.     ANSWER\r\n" );
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