PROOF 66
Prove.
Why squares rather than absolute values
On finite data.
Definition D1
The mean x̄ of data x₁, …, xₙ is the value satisfying n x̄ = Σxᵢ. With the data arranged in increasing order and n = 2m + 1, the middle value x₍ₘ₊₁₎ is called the median x̃.
Proof.
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