Find standard deviation given standard deviation

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How would I find the standard deviation of a value, V that is the average of other values, say heights of people, given that I have the standard deviation of the heights? I'm looking to improve my intuition and understanding of standard deviation.

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You need to know that:

  • the variance of the sum of independent variables is the sum of the variances
  • the standard deviation is the square root of the variance.
  • sd$(\lambda X) = \vert \lambda \vert $sd$(X)$, for $\lambda \in \mathbb R$.

Hope this helps.