document.write( "Question 1200783: It is reported that 15% of people who come into contact with a person infected with strep throat contract the disease. How might we use the random-number table to estimate the probability that at least one child in a three-child family will catch the disease, given that each child has come into contact with an infected person? \n" ); document.write( "

Algebra.Com's Answer #834988 by ikleyn(52778) $\"\"$ $\"About$

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document.write( "\"At least one\" is the complement event to \"no one\".\r\n" );
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document.write( "It gives the ANSWER\r\n" );
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document.write( "    P(at least one) = 1 - P(no one) = 1 - (1-0.15)^3 = 1 - 0.85^3 = 0.385875 (rounded).\r\n" );
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