( )1. A doctor recorded the survival time of 6 tumor patients after the chemical therapy. 5 of them are 1month, 1month, 2month, 3month, 3month, respectively. However, the last patient still survived when the doctor visited him at the 6th month after the therapy. To describe the central location of the data, what measure should we use? A. Arithmetic mean В. Mode C. Geometric mean D. The 50th percentile

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