document.write( "Question 472389:  Help please!
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document.write( "Three people are selected at random from five females and nine males. Find the probability of the following. (to three decimal places.)\r
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document.write( "a) At least one is a male.
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document.write( "b) At most two are male. \n" );
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| Algebra.Com's Answer #323908 by sudhanshu_kmr(1152)     You can put this solution on YOUR website! 5 females and 9 males\r \n" ); document.write( "\n" ); document.write( "Number of ways to select 3 out of total 14 = 14C3= 364\r \n" ); document.write( "\n" ); document.write( "a) number of ways to select 3 when all are female = 5C3 = 10 \n" ); document.write( " \n" ); document.write( " probability that all are females P(A) = 10/364\r \n" ); document.write( "\n" ); document.write( " probability that at least one is male P'(A)= 1 - 10/364 \r \n" ); document.write( "\n" ); document.write( "= 354/364 \n" ); document.write( " \n" ); document.write( "= 0.9725\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "b) number of ways to select 3 when all there are male = 9C3 = 84\r \n" ); document.write( "\n" ); document.write( "probability that all are male P(B) = 84/364\r \n" ); document.write( "\n" ); document.write( " probability that at most 2 are male P'(B)= 1 - 84/364 \r \n" ); document.write( "\n" ); document.write( "= 280/364 \n" ); document.write( " \n" ); document.write( "= 0.76923 (approx)\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( "May be some calculation mistakes, try to solve it yourself. \n" ); document.write( "if any doubt please contact.... \n" ); document.write( " \n" ); document.write( " |