Question

Write down the formula for finding out various measures of dispersion.

Answer 1

1) Range

Range = L - S

Co - efficient or range = \(\frac{L - S}{L + S}\)

2) Inter Quartile Range = Q₃ - Q₁

Quartile deviation = \(\frac{Q_3 - Q_1}{2}\)

Coefficient of Q.D = \(\frac{Q_3 - Q_1}{Q_3 + Q_1}\)

3) Mean deviation

MD in individual series = \(\frac{\sum |D|}{N}\)

MD in descrete series = \(\frac{\sum F |D|}{N}\)

MD in continuous series = \(\frac{\sum F |D|}{N}\)

Co - efficient of MD = \(\frac{MD}{X}\)

4) Standard deviation for individual Series/ungrouped Data

For Discrete continuous Series