How to calculate strength of the team?

Team strength is calculated as follows:
Calculate all the forces of defense and by the number of formations - (99 +78 +69): 3 = 82
Offense: (86 +89 +82): 3 = 85.67
Stream: (41 +42 +31): 3 = 38
Goalkieper: 76
Total: sum all the results of what you went and added the gate and finally divide bythe fourth
(82 +85.67 +38 +76) 4 = 70.4175

Goaltenders	Strength		Goaltenders	Strength
Goaltenders	76		Goaltenders	18
Line 1	Strength		Line 1	Strength
Defence	99		Defence	27
Offence	86		Offence	25
Shooting	41		Shooting	18
Line 2	Strength		Line 2	Strength
Defence	78		Defence	28
Offence	89		Offence	26
Shooting	42		Shooting	18
Line 3	Strength		Line 3	Strength
Defence	69		Defence	29
Offence	82		Offence	29
Shooting	31		Shooting	18
Line 4	Strength		Line 4	Strength
Defence			Defence	22
Offence			Offence	27
Shooting			Shooting	18