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NDA 2018
Exam
NDA
Year
2018
Subject
Mathematics
Chapter
Statistics

NDA 2018 · Mathematics · Statistics

In any discrete series (when all values are not same) if x...

In any discrete series (when all values are not same)ifxif x represents mean deviation about mean and y represents standard deviation, then which one of the following is correct?

Options

  1. Ay≥x\mathrm{y} \geq \mathrm{x}
  2. By≤x\mathrm{y} \leq \mathrm{x}
  3. Cx=yx=y
  4. Dx<yx < y

Correct answer

D. x<yx < y

Step-by-step solution

x= M.D., y= S.D. M.D. =45 S.D. ⇒x<y\begin{aligned} & x=\text{ M.D., } y=\text{ S.D. } \\ & \text{M.D. }=\frac{4}{5} \text{ S.D. } \Rightarrow x < y\end{aligned}
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