The American Shorthair Cat is a popular breed of house cat. They have a mean weight of 11 pounds with a standard deviation of 1.5 pounds. The French Bulldog is a popular breed of dog. They have a mean weight of 22 pounds with a standard deviation of 3 pounds. A household has one of each of these pets. Their American Shorthair Cat weighs 9 pounds. The French Bulldog weighs 15 pounds. What is the z-score for the American Shorthair Cat?