12 . 30 Choose an American household at random and let the random variable X be the number of cars (including SUVS and light trucks the residents own Here is the probability model if we ignore the few households that own more than six cars : Number of cars X O 4 6 Probability 0.09 0.33 0 . 36 0 . 14 0 .05 0 .02 0 . 01 A housing company builds houses with two - car garages . What percent of households have more cars than the garage can hold ( 2 1496 ( b / 22 0 6 ( C )4296