Calculate the range and coefficient of range from the following data:
Number of trees planted in $6$ months: $186, 234, 465, 361, 290, 142$

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Solution

$X_{m a x} = 168, X_{m i n} = 465$
So, Range $= X_{m a x} - X_{m i n} = 465 - 142 = 323$
Coefficient of range $= \frac{X_{m a x} - X_{m i n}}{X_{m a x} + X_{m i n}} = \frac{465 - 132}{465 + 142} = \frac{323}{607} = 0.53$

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