ranked data.

3.16 Specify the single average—the mode, median, or mean—described by the following statements.

(a) It never can be used with qualitative data.

(b) It sometimes can be used with qualitative data.

(c) It always can be used with qualitative data.

(d) It always can be used with ranked data.

(e) Strictly speaking, it only can be used with quantitative data.