The frequency distribution for population density (persons per square mile) for the 50 U.S. states is as follows:

Population Density                   Number of States
0–under 100............................................................ 27
100–under 200........................................................ 11
200–under 300......................................................... 4
300–under 400.......................................................... 1
400–under 500.......................................................... 2
500–under 600.......................................................... 1
600–under 700.......................................................... 0
700–under 800.......................................................... 1
800–under 900.......................................................... 1
900–under 1000........................................................ 0
1000–under 1100...................................................... 1
1100–under 1200...................................................... 1

Does this distribution appear to be symmetrical? If not, is it skewed positively or negatively?