how to find the contribution to variation in density can you determine tonnage variation why is density important what is determining density's contribution to variation in tonnes how do i measure tonnage what's density's contribution to variation in tonnes how do you calculate tonnage variability in a train how is density a variable of variation? which data type is used to measure variation in tonnage? what is tonnage in trains how do you measure density how to determine density in a train how do you determine density's contribution to variance in the variation in tonnes? how to determine the contribution to tonnage variability of a variable what is the contribution of a variable in tonnage to variation how do you measure density what is the contribution of density to tonnage what is the contribution of the density to the variation in tonnes can we use tonnage in train carriage which variable accounts for variation in tonnage?