1. Twenty-eight percent of households in the United States have dogs, 21% have cats, and dogs and 10% have both a dog and a cat. na) What is the proportion of both a dog and a cat?nb) What is the probability that in one of these households there are neither dogs nor cats? nc) If there is a cat in a house, what is the probability that there is also a dog? nd) If there is no dog in a house, what is the probability that they have a cat?