Calculate the range and coefficient of range with following data
Marks 0-10 10-20 20-30 30-40 40-50
No. of student 02 05 07 08 03

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Solution

$x_{m}$ = Mid value of highest class = $45$
$x_{o}$ = Mid value of lowest class = $5$
Therefore,
Range = $x_{m} - x_{o} = 45 - 5 = 40$
Coefficient of range = $\frac{x_{m} - x_{o}}{x_{m} + x_{o}}$

= $\frac{45 - 5}{45 + 5} = \frac{40}{50} = \frac{4}{5} = 0.8$

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Class-interval:	0-10	10-20	20-30	30-40	40-50
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Age in years	0-10	10-20	20-30	30-40	40-50
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