In any discrete series (when all values are not same) the relationship between M.D. about mean and S.D. is

# In any discrete series (when all values are not same) the relationship between M.D. about mean and S.D. is

1. A

$M.D.=S.D$

2. B

3. C

$M.D.

4. D

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### Solution:

Let ${x}_{i}/{f}_{i};i=1,2,\dots ,n$ be a frequency

distribution. Then,

$=\sqrt{\frac{1}{N}\sum _{i=1}^{n} {f}_{i}{\left({x}_{i}-\overline{X}\right)}^{2}}$ and

let $\left|{x}_{i}-\overline{X}\right|={z}_{i};i=1,2,\dots ,n.$ Then,

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