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

Explanation

Let the assumed mean be `A=1400` and `h=400`


Calculation of mean


We have, `A=1400,h=400, sum f_i u_i=-1395` and `N=1343`


Mean =`A+h[1/n sum f_i u_i]`


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