5 students obtained following marks in statistics:
20, 35, 25, 30, 15
Find out range and coefficient of range.

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Solution

Here,

Highest value (H)= 35
Lowest value (L) = 15

Range= Highest value − Lowest value

i.e. R= H− L

Substituting the given values in the formula

R= 35 − 15= 20

Coefficient of Range is as follows:

$CR = \frac{H - L}{H + L} or, CR = \frac{35 - 15}{35 + 15} = \frac{20}{50} \Rightarrow CR = 0.4$

Hence, the range (R) of the above data is 20 and coefficient of Range (CR) is 0.4

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