Bunuel wrote:

What is the difference between the mean and the median of the positive numbers, k, k + 3, k + 4, k + 8, k + 9, k + 12?

(A) 0

(B) 1

(C) 6

(D) 2k

(E) 5k

In a set of 6 elements, the median is the average of the middle two terms.

The median of the 6 elements is \(\frac{k+4+k+8}{2} = k+6\)

The mean of the 6 elements is \(\frac{6k + (3+4+8+9+12)}{6} = \frac{6k + 36}{6} = k + 6\)

Therefore, the difference between mean and median is

0(Option A)
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