document.write( "Question 1166124: A fair coin is flipped four times and the observations recorded. Event A = Observing at least two heads. What is P(A)? \r
\n" ); document.write( "\n" ); document.write( "Write your answer as a fraction in reduced form. \n" ); document.write( "
Algebra.Com's Answer #790620 by solver91311(24713)\"\" \"About 
You can put this solution on YOUR website!
\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "There are exactly 16 different outcomes of flipping a coin four times:\r
\n" ); document.write( "\n" ); document.write( "One way to get all four heads, four ways to get 3 heads, six ways to get 2 heads, four ways to get 1 head, and one way to get 0 heads.\r
\n" ); document.write( "\n" ); document.write( "
\r\n" );
document.write( "     H H H H    4 H, 0 T\r\n" );
document.write( "     \r\n" );
document.write( "     H H H T    3 H, 1 T\r\n" );
document.write( "     H H T H\r\n" );
document.write( "     H T H H\r\n" );
document.write( "     T H H H\r\n" );
document.write( "\r\n" );
document.write( "     H H T T    2 H, 2 T\r\n" );
document.write( "     H T H T\r\n" );
document.write( "     H T T H\r\n" );
document.write( "     T H H T\r\n" );
document.write( "     T H T H\r\n" );
document.write( "     T T H H\r\n" );
document.write( "\r\n" );
document.write( "     T T T H    1 H, 3 T\r\n" );
document.write( "     T T H T\r\n" );
document.write( "     T H T T\r\n" );
document.write( "     H T T T\r\n" );
document.write( "\r\n" );
document.write( "     T T T T    0 H, 4 T\r\n" );
document.write( "
\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "11 of these 16 outcomes have two or more heads.\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "John
\n" ); document.write( "
\n" ); document.write( "My calculator said it, I believe it, that settles it
\n" ); document.write( "\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "I > Ø
\n" ); document.write( " \n" ); document.write( "
\n" );