**Standard Deviation**is the most widely used method to measure the Dispersion of a set of data. It measures the deviation of elements of a population or dataset from its mean.

- Standard Deviation is calculated as
**the positive square root of the mean of squared deviations from the mean.**

### Coefficient of Variation

- For a given dataset, the
**Coefficient of Variation is the ratio of Standard Deviation to the Mean.** - Coefficient of Variation or CV = Standard Deviation / Mean

####
**Example 1: **

- Let us take a sample: 2,5,8,10,12,15,18 and calculate is Coefficient of Variation
**Solution:****Its Mean**= 10 and its**Standard Deviation**is 5.567- Now,
**Coefficient of Variation CV = Standard Deviation / Mean** **CV = 5.567 / 10 = 0.5567**