document.write( "Question 271154: from a bag containing 2 rupee-coins and 3 twenty paise coins, a person is asked to draw two coins at random. find the values of his expectaion \n" ); document.write( "

Algebra.Com's Answer #198555 by Edwin McCravy(20060) $\"\"$ $\"About$

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from a bag containing 2 rupee-coins and 3 twenty paise coins, a person is asked to draw two coins at random. find the values of his expectation.
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document.write( "1 rupee = 100 paise\r\n" );
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document.write( "Therefore, a twenty paise coin is  or  rupee-coin.\r\n" );
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document.write( "If he draws:\r\n" );
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document.write( "A.   2 rupee-coins, that = 2 rupee\r\n" );
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document.write( "B.   1 rupee-coin and 1 twenty paise coins that = 1.2 rupee\r\n" );
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document.write( "C.   2 twenty paise coins, that = 0.4 rupee\r\n" );
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document.write( "Number of ways to draw A:  Draw 2 rupee-coins 1 way\r\n" );
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document.write( "Number of ways to draw B:  Draw 1 rupee-coins 2 ways TIMES 3 ways to\r\n" );
document.write( "draw 1 twenty paise coin.  That is 2x3 = 6 ways. \r\n" );
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document.write( "Number of ways to draw C:  Draw 2 rupee-coins 3 ways.\r\n" );
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document.write( "Number of ways to draw ANY 2 coins = 5C2 = 10 ways.\r\n" );
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document.write( "Probability of A = \r\n" );
document.write( "Probability of B = \r\n" );
document.write( "Probability of C = \r\n" );
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document.write( " Draw  Value x Probability = Expectation \r\n" );
document.write( "  A     2    x   0.3            .6\r\n" );
document.write( "  B     1.2  x   0.6            .72\r\n" );
document.write( "  C     0.4  x   0.1            .04\r\n" );
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document.write( "                 1.0           1.36 rupees\r\n" );
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document.write( "Expectation = 1.36 rupees.\r\n" );
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document.write( "Edwin

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