There were 870 households of which 33.7% had children under the age of 18 living with them, 51.8% were Marriage living together, 10.0% had a female householder with no husband present, 2.9% had a male householder with no wife present, and 35.3% were non-families. 27.1% of all households were made up of individuals and 10.5% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.17.
Question: How many percent larger is the average family size than household size?
Answer: .63