Marks of four students are 25, 35, 45 and 55 their mean deviation from mean is

Foundation

Mathematics Foundation

Measure of Central Tendency

9th basic statistics

Question

Marks of four students are 25, 35, 45 and 55 their mean deviation from mean is

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Mean $= \frac{\sum x_{i}}{N} = \frac{160}{4} = 40$
mean deviation from mean is
$= \frac{\sum |x_{i} - \bar{x}|}{N} = \frac{40}{4} = 10$