document.write( "Question 1193590: Suppose a fair coin is tossed three times. Let X be the random variable that represents the number of heads obtained. Find the cumulative distribution function of X. \n" ); document.write( "

Algebra.Com's Answer #848724 by ikleyn(52798) $\"\"$ $\"About$

You can put this solution on YOUR website!
.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The answer in the post by the other tutor is incorrect and is written in absurdist form.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "In this problem, the random variable X has the values 0, 1, 2, 3.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The right form for the cumulative distribution function in this problem is\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "    F(x) = 1/8  for x = 0;\r\n" );
document.write( "\r\n" );
document.write( "    F(x) = 1/2  for x = 1;\r\n" );
document.write( "\r\n" );
document.write( "    F(x) = 7/8  for x = 2;\r\n" );
document.write( "\r\n" );
document.write( "    F(x) =  1   for x = 3.\r\n" );
document.write( "

\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );