The mean deviation of the series a, a+d, a+2d, ……, a+2n from its mean is
Given, Series is a, a+d, a+2d,…,+a+2n
Mean (X) = 
Now, deviation from mean is xi-X
M.D = 
M.D = 
M.D = 
Hence, M.D = 
7
The mean deviation of the series a, a+d, a+2d, ……, a+2n from its mean is
Given, Series is a, a+d, a+2d,…,+a+2n
Mean (X) =
Now, deviation from mean is xi-X
M.D =
M.D =
M.D =
Hence, M.D =