[notum]

Actually "half" is pretty dang well defined :)

[rsfern]

Well even if you take the most symmetric halves by volume, the density of an ideal elephant is not uniform. Some organs don’t come in pairs and all that

I guess it depends on how many hairs you want to split and how precise you want the answer

[Engineering-MD]

However most unpaired organs don’t contribute to a mass asymmetry. It’s thought this has evolved to aid with locomotion as any asymmetry will negative impact on efficiency

[notum]

The answer can never be precise for the very reason that not all elephants weight the same (breed, age etc.).

I was looking for an average from the get-go, but a half is a half!

[rsfern]

I agree with you that a reasonable answer is an average, but a half on a volume basis is not necessarily equivalent to a half on a mass basis

[charcircuit]

I disagree. You can have a left half and right half, but also a front half and rear half.

Half of the weight of an element would be well defined since it is just a number.