List of formulas you requested:

  1. Variance (D):
    [
    D = \frac{1}{N} \sum_{i=1}^{N} (x_i – \bar{x})^2
    ]
    where (N) is the number of observations, (x_i) is each value, (\bar{x}) is the mean.
  2. Standard deviation (σ):
    [
    \sigma = \sqrt{D}
    ]
    or
    [
    \sigma = \sqrt{\frac{1}{N} \sum_{i=1}^{N} (x_i – \bar{x})^2}
    ]
  3. Coefficient of variation (CV):
    [
    CV = \frac{\sigma}{\bar{x}} \times 100\%
    ]
    where (\sigma) is the standard deviation, (\bar{x}) is the mean.

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