(b) The following data was obtained from a study of an ecosystemin which 10 different species were randomly identified and theirheights measured. As a Research Assistant for Plant EcologyLaboratory, determine:

(i) Mean height of all species combined

(ii) Variance as a measure of variability in plant height

(iii) Standard deviation

SPECIES HEIGHT(cm)

1. Beech (Fagus spp.) 300 cm

2.Hackberry (Celtis occidentalis) 90cm

3. Southern red oak (Quercus faclcata) 80 cm

4. Dogwood (Comus florid) 600 cm

5. Longleaf Pine (Pinus palustris) 2,450

6. Magnolia (Magnolia sp.) 1,250

7. Red Maple (Hacer rurua) 710

8. Shortleaf Pine (Pinus echinata) 1,350

9. Sweetgum (Liquidamba styracilua) 1,210

10. Wax Myrtle 1,150

11. Cabbage palmetto (Sabal palmetto) 60

12. Live oak (Quercus rubra) 2,055

13. Water oak (Q. nigra) 1,925

14. Scarlet oak (Q. coccinea) 1,075

15. Bald cypress (Taxodium distichum) 996

16. Black hickory (Carya sp.) 878

17. Black oak (Q. macrocarpa) 1,225

18. Wild Blackberry (Prunus serotina) 1,027

19. Eastern Cottonwood (Populus deltoides) 800

20. Virginia pine (Pinus virginiana) 1,330

c) Given the data as indicated above,

(i) Is this a predominantly terrestrial or aquatic ecosystem?Why?

(ii) Would you consider this a mixed hardwood/pineecosysyetm?

(iii) Which plant species form the overstory of thisecosystem?

(iv) Is this a stable community?