for a certain dog breed, the number of puppies in a litter typically varies from 2 to 6. the following table shows the probability distribution of the random variable n, where n represents the number of puppies in a litter. also shown are the squared deviations, or distances, from the expected value of 4.5 for the distribution. number of puppies 2 3 4 5 6 squared deviation 6.25 2.25 0.25 0.25 2.25 probability 0.05 0.15 0.25 0.35 0.20 what is the variance of the distribution? responses