Of a batch of 20 students, 4 students failed while 7 students passed with distinction. The remaining students who passed ordinarily scored the following marks : 47, 52, 49, 57, 52, 58, 66, 64, 59 The students who failed scored 23 marks on an average while the students who passed with distinction scored 76 marks on an average. Find the mean marks and the median marks.

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