document.write( "Question 1168766: The probability that a birth will result in twins is 0.015 . Assuming independence​ (perhaps not a valid​ assumption), what is the probability that out 190 births in a​ hospital, there will be exactly 2 sets of​ twins? \n" ); document.write( "
Algebra.Com's Answer #793394 by ikleyn(52879)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "
\r\n" );
document.write( "It is the binomial type probability distribution.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "The number of trial n= 190; the probability of the success trial is  0.015,  and the number of success trial k = 2. \r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "P = \"C%5B190%5D%5E2%2A0.015%5E2%2A%281-0.015%29%5E%28190-2%29\" = \"%28%28190%2A189%29%2F%281%2A2%29%29%2A0.015%5E2%2A0.985%5E188\" = 0.235711.     ANSWER\r\n" );
document.write( "
\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "---------------\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "To see many other similar solved problems, look into the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Simple and simplest probability problems on Binomial distribution \r
\n" ); document.write( "\n" ); document.write( "    - Typical binomial distribution probability problems \r
\n" ); document.write( "\n" ); document.write( "in this site.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );