Write a question about the following article: There were 2,380 households of which 18.4% had children under the age of 18 living with them, 28.6% were Marriage living together, 6.3% had a female householder with no husband present, 3.2% had a male householder with no wife present, and 61.9% were non-families. 32.1% of all households were made up of individuals and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.82.

Question about the article:
Which groups in average were under 3?