A man is sitting in front of a computer monitor holding a keyboard and looking at the camera .
There is a better than even chance that there is a man looking in front of a computer monitor because he is video chatting .
There is a better than even chance that there is a man looking in front of a computer monitor because he is video chatting .
It is improbable that there is a man looking in front of a computer monitor because he is video chatting .
There is a man looking in front of a computer monitor because he is video chatting .