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The root mean square deviation is commonly known as :

  • A.Variance
  • B.Standard deviation
  • C.Mean deviation
  • D.Quartile deviation

Answer: B

The root mean square deviation is the Standard deviation.

Standard deviation is found by squaring each deviation from the mean, taking the mean of those squares, and then the square root: literally the root of the mean square deviation.

\[ \sigma = \sqrt{\frac{\sum (x - \bar{x})^2}{n}} \]

Variance is the mean square deviation before the root is taken. Mean deviation averages the absolute deviations without squaring, and quartile deviation is half the interquartile range.

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