- Given the following joint distribution: - Denominator can be viewed as a normalization constant ,(P is a distribution) the prob. of howing cowiey, tothache, catch cit the P( Cavity toothache )=P( Cavity, toothache ) scume eime =[P( Cavity, toothache, catch )+P( Cavity, toothache, catch )]=[0.108,0.016>+0.012,0.064>]=<0.12,0.08><0.6,0.4> why there are two terms? - Normalization is a useful shortcut in many probability calculations..