Out of 190,638 households, 29.9% have children under the age of 18 living with them, 28.5% were married couples living together, 24.8% had a female householder with no husband present, and 41.3% were nonfamilies. 35.2% of all households were made up of individuals and 11.1% had someone living alone who is 65 years of age or older. The average household size was 2.44 and the average family size was 3.19. The age distribution of the population shows 28.5% under the age of 18, 9.5% from 18 to 24, 30.4% from 25 to 44, 19.0% from 45 to 64, and 12.5% who are 65 years of age or older. The median age was 33 years. For every 100 females, there were 90.0 males. For every 100 females age 18 and over, there were 85.2 males.. How many people make up the difference between the average household size and average family size?