Weight (in kg)    Number of Wrestlers (fi)               Class Marks (xi)  Deviation

(di = xi – a)

fidi

100 – 110            4             105        –20        –80

110 – 120            14           115        –10        –140

120 – 130            21           125        0             0

130 – 140            8             135        10           80

140 – 150            3             145        20           60

N = Σfi = 50                        σfidi = – 80

∴ Assumed mean, (a) = 125

Class width, (h) = 10

also, all out perceptions, (N) = 50

By step deviation strategy,

= 123.4kg

Consequently, mean load of grapplers = 123.4kg