1.

Find the mean deviation from mean of the observations: a, a+d, ., (a+2nd).

A. n(n + 1)d<sup>2/3</sup>
B. n(n + 1)d<sup>2</sup>/2
C. a + n(n + 1)d<sup>2</sup>/2
D. n(n + 1)d/(2n + 1)
Answer» E.


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