It is the simplest of the values of Dispersion. It is merely the difference between the largest and smallest term. Symbolically;

or Range = Largest term-Smallest term.

And Coefficient of Range = L-S/L+S

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It is also known as Ratio of Range or Co-efficient of Scatteredness.

If the averages of the two distributions are close to each other, a comparison of the ranges shows that the distribution with the smaller range has less dispersion. The average of that distribution is more typical of the group.

**How to Compute Range Individual Series****: **

Example 1. Find Range and Coefficient of Range for following data.

**Solution: **

Here L =45 and S=3;

Range=L-S =45-3= 42

And Co-efficient of Range = L-S/L-S =45-3/45+3 = 42/48= .875

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(Note. Here Range is Absolute measure and Co-efficient of Range is Relative measure)

**Discrete Series:**

**Example 2. Find Range and Coefficient of Range for following data: **

**Solution**:

Going through the variables S = 5 ; and L = 40 .•. Range = 40-5 = 35… [R=L-S]

[C.R.=L-S/L+S]

And Coefficient of Range=40-5/40+5= .778

Continuous Series

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Example 3. Find ‘Range and ‘Coefficient of range’ of the following data:

**Solution****: **

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(Note. You may take the Mid Points of Class intervals and get the result. So any of the methods can be applied)