document.write( "Question 1153151: If one person is randomly selected, what is the probability of selecting a
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document.write( "          | O | A | B |AB |\r\n" );
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document.write( "Type Rh+  |37 |36 | 9 | 3 |\r\n" );
document.write( "Type Rh-  | 7 | 6 | 1 | 1 |
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Algebra.Com's Answer #775318 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
If one person is randomly selected, what is the probability of selecting a
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When you have a table like this given\r\n" );
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document.write( "          | O | A | B |AB |\r\n" );
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document.write( "Type Rh+  |37 |36 | 9 | 3 |\r\n" );
document.write( "Type Rh-  | 7 | 6 | 1 | 1 |\r\n" );
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document.write( "Always add on a column of totals on the right and\r\n" );
document.write( "a row of totals on the bottom, like this, and add\r\n" );
document.write( "the numbers across and down, and the total of the\r\n" );
document.write( "new column should equal the total of the new row.\r\n" );
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document.write( "          | O | A | B |AB |Totals|\r\n" );
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document.write( "Type Rh+  |37 |36 | 9 | 3 |  85  |\r\n" );
document.write( "Type Rh-  | 7 | 6 | 1 | 1 |  15  |\r\n" );
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document.write( "Totals    |44 |42 |10 | 4 | 100  |\r\n" );
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document.write( "So we add all those that are either in the \"Type Rh+\" row or\r\n" );
document.write( "in the \"O\" column. That is, the red ones below fit the property\r\n" );
document.write( "of being in one OR the other category:\r\n" );
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document.write( "          | O | A | B |AB |Totals|\r\n" );
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document.write( "Type Rh+  |37 |36 | 9 | 3 |  85  |\r\n" );
document.write( "Type Rh-  | 7 | 6 | 1 | 1 |  15  |\r\n" );
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document.write( "Totals    |44 |42 |10 | 4 | 100  |\r\n" );
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document.write( "That's 37 + 36 + 9 + 3 + 7 = 92\r\n" );
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document.write( "It's that many, 92, out of 100, so the answer is \r\n" );
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document.write( "\"92%2F100=23%2F25=0.92\"\r\n" );
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document.write( "[Notice that we can't just add the \"Rh+\" row, 85, to the \"O\" column to get 44+85,\r\n" );
document.write( "which is too many, 129, because that would be adding the 37 twice, unless we\r\n" );
document.write( "then subtracted the 37 and then got 129-37 which is 92.]  \r\n" );
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document.write( "Edwin

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