PROOF 170
Prove.
The ambiguity in defining quartiles
On finite data.
Definition D1
The data arranged in order of size are written x₍₁₎ ≤ ⋯ ≤ x₍ₙ₎. If n is odd, the middle value is the median; if n is even, the mean of the two middle values is the median.
Proof.
Related labs