Find the mean deviation from the mean and standard deviation of the series:

a, a+d, a+2d, ....., (a+nd), .... a+(2n-1)d, a+2nd

its urgent..

Given series is:

a, a+d, a+2d, ....., (a+nd), .... + a+(2n-1)d + (a + 2nd)

Here, the last term in the series is (a + 2nd). Clearly, it is (2n + 1) term in the given series.


Now, mean deviation about the mean


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