Answer:
   State          density (people/ unit area)
Explanation:
Population density measures how concentrated are the people of a region.
It is calculated dividing the number of people by the square unit of area:
This table shows the detailed calculation for every state of the question:
State   Pop. estimate   Area    density (people / unit area)
Cal.    36,500,000   163,707  36,500,000 / 163,707 ≈ 222.96 ≈ 223.0
Florida  18,300,000   65,758   18,300,000 / 65,758 ≈ 278.29 ≈ 278.3
Iowa     2,990,000   56,276  2,990,000 / 56,276  ≈ 53.13 ≈ 53.1
New J.   8,690,000    8,772  8,690,000 / 8,772    ≈ 990.65 ≈ 990.7
Wyoming   522,000    97,818   522,000 / 97,818   ≈ 5.34 ≈ 5.3