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
![](https://www.sarthaks.com/?qa=blob&qa_blobid=9413350229779024190)
For Discrete continuous Series
![](https://www.sarthaks.com/?qa=blob&qa_blobid=15235321991530866404)