A pair of dice is thrown and if the total number is at most 4, then a coin is thrown. (a) (3 points) What is the size of the sample set in this experiment? O O 36 37 48 O 54 56 46 0 72 42 O 38 (b) (2 points (bonus)) Each "die dot" is assigned a score of 1, a "Tail" is assigned a score of 0 and a "Head" is assigned a score of 1. Find the probability of scoring at most 5 in this experiment. O 5/365/72 5/18 O 5/9 7/36 O 7/72 7/18 O O 7/9