Consider the four values 5, 6, 9 and 12. Which statements about the median of this data set are true? Select all that apply.

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The values are already in order and the two central ones are 6 and 9, whose mean is 7.5, so that is the median even though 7.5 never appears in the list. Keeping 9 alone uses only the larger of the two central values, which leaves the result above the centre because the smaller central value is given no weight.