What percentage of total body weight is contained in the lower leg? (below the knee and including the ankle & foot) I just need the mean %.

The question is what mean percentage of total body weight is contained in the lower leg below the knee and including the ankle and foot?

Step-by-Step Answer:
 

• The lower limb is 15.7% of total body weight subdivided as:

thigh: 63% of this 15.7%
shank: 27.9% of this 15.7%
foot: 8.93% of this 15.7% 99.83% or ~100% total

• The average weight of the typical human male is:

average height 5 feet 9 inches;
ideal body weight for men:
weight (kg) = 50 + 2.3 kg per inch over 5 feet
 

Thus, for a man of 5 feet 9 inches: 70.7 kg or 155.87 lbs
[Note: for women weight (kg) = 45.5 + 2.3 kg per inch over 5 feet]

• Lower limb weight:

15.7% of 155.87 lbs = 24.47 lbs
Shank weight = 27.9% of 24.47 = 6.83 lbs
Foot weight = 8.93% of 24.47 = 2.19 lbs
total est. weight of lower leg (with foot and ankle): 9.02 lbs
9.02/155.87 x 100 = 5.79% of total body weight
 

References:
 

Chaffin, D.B., Andersson, G.B.J., and Martin, B.J., “Occupational Biomechanics,” 3rd Edition (illustrated), John Wiley & Sons, Incorporated, 1999, p. 73. ISBN 0-471-24697-2 (Great Book!)
 

Auger, Dan, Prosthetic Research Manager, DePuy Orthopaedics.
 

Formulas for Calculating Ideal Body Weight
http://www.halls.md/ideal-weight/devine.htm