The table below gives the distribution of villages under different heights from sea level in a certain region. Compute the mean height of the region: Height (in metres) 200 600 1000 1400 1800 2200 No. of village: 142 265 560 271 89 16

Answer

(i) 984.51
(ii) Mean by step deviation method. (iii) Villages are important to keep a balance between the ecological problems.