document.write( "Question 156690This question is from textbook Algebra 1 An Incremental Development
\n" ); document.write( ": [The question I am having trouble with is 5]\r
\n" ); document.write( "\n" ); document.write( "4. A jar contains 13 black and 12 red marbles. If one marble is drawn at random, what is the probability that it is black? [My answer is 13/25]\r
\n" ); document.write( "\n" ); document.write( "5. If two marbles are drawn randomly from the jar in prblem 4, what is the probability that the first is red and the second black is the marbles are drawn...
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Algebra.Com's Answer #115512 by jim_thompson5910(35256)\"\" \"About 
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4) Correct.\r
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\n" ); document.write( "\n" ); document.write( "a) With Replacement\r
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document.write( "                   # of red marbles      12\r\n" );
document.write( "P(First is red) = ------------------ =  ----\r\n" );
document.write( "                  total # of marbles     25\r\n" );
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\n" ); document.write( "\n" ); document.write( "Since you are replacing the marble (ie putting it back), this means that the total number of marbles stays the same\r
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document.write( "                      # of black marbles      13\r\n" );
document.write( "P(Second is black) = ------------------ =  -------\r\n" );
document.write( "                     total # of marbles       25\r\n" );
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\n" ); document.write( "\n" ); document.write( "b) Without Replacement\r
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document.write( "                   # of red marbles      12\r\n" );
document.write( "P(First is red) = ------------------ =  ----\r\n" );
document.write( "                  total # of marbles     25\r\n" );
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\n" ); document.write( "\n" ); document.write( "Now since you are NOT replacing the marble, this means that the total number of marbles will go from 25 to 24\r
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document.write( "                      # of black marbles            13         13\r\n" );
document.write( "P(Second is black) = ----------------------    = --------- =  -----\r\n" );
document.write( "                     total # of marbles - 1         25-1       24\r\n" );
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