Question

Asked Oct 21, 2019

the variance and standard deviation are based on the________________?

Step 1

**Variance, standard deviation and mean deviation:**

**Variance** is the average of squared difference of sample points from their mean. The square root of the variance is known as **standard deviation**. **Mean deviation** is the average of absolute deviation of sample points from their measure of central tendency (mean, median, and mode).

Step 2

Variance, standard deviation, and mean deviation are three measures of dispersion. All these measures tell how much the data vary from their average. The common thing between these three measures is that they show **how much the data varies from their mean**. For finding the values of variance, standard deviation and mean deviation, one has to find the difference of the...

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