document.write( "Question 1156344: Mr. and Mrs. Doran have a genetic history such that the probability that a child
\n" ); document.write( "being born to them with a certain trait is 87%. If they have seven children,
\n" ); document.write( "what is the probability that at least four of their seven children will have
\n" ); document.write( "that trait? Round your answer to the nearest thousandth.
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Algebra.Com's Answer #779166 by Edwin McCravy(20056) $\"\"$ $\"About$

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Mr. and Mrs. Doran have a genetic history such that the probability that a child
\n" ); document.write( "being born to them with a certain trait is 87%. If they have seven children,
\n" ); document.write( "what is the probability that at least four of their seven children will have
\n" ); document.write( "that trait? Round your answer to the nearest thousandth.
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document.write( "There are two ways to do it with a TI-83 or 84\r\n" );
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document.write( "FIRST WAY:\r\n" );
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document.write( "The complement event is that 3 or fewer will have that trait. \r\n" );
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document.write( "Press 2ND VARS and scroll down to binomcdf(, [careful, not binompdf(]\r\n" );
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document.write( "that's 7 trials, p=0.87, x value 3\r\n" );
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document.write( "Should have on your screen\r\n" );
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document.write( "binomcdf(7,0.87,3)\r\n" );
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document.write( "press ENTER\r\n" );
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document.write( "0.0072028157\r\n" );
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document.write( "Subtract from 1.\r\n" );
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document.write( "1-0.0072028157\r\n" );
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document.write( "0.9927971843  round to 0.993\r\n" );
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document.write( "--------------------------------\r\n" );
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document.write( "SECOND WAY\r\n" );
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document.write( "That's the same thing as 3 or fewer will not have the trait.\r\n" );
document.write( "The probability of not having the trait is 1-0.87=0.13.\r\n" );
document.write( "\r\n" );
document.write( "Press 2ND VARS and scroll down to binomcdf(, [careful, not binompdf(]\r\n" );
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document.write( "that's 7 trials, p=0.13, x value 3\r\n" );
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document.write( "Should have on your screen\r\n" );
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document.write( "binomcdf(7,0.13,3)\r\n" );
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document.write( "press ENTER\r\n" );
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document.write( "0.9927971843  round to 0.993\r\n" );
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document.write( "Edwin

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