household income average number of car per household less than $20,000 1.4 $20,000 --- $29,999 1.7 $30,000 --- $39,999 1.9 $40,000 --- $49,999 2.4 $50,000 --- $74,999 2.6 $75,000 --- $99,999 2.9 $100,000 --- $124,999 3.1 $125,000 --- $149,999 3.3 $150,000 and over 3.6 the relationship between household income and average number of car per household is:
