A University Director of Studies records the number of students failing the examinations of several courses. The data are presented in the following stem and leaf plot where the stems are with units 10 and the leaves are with units 1.  0| 224 0| 59 1| 59 1| 57889 2| 2| 3| 144 3| 5 (i) Determine the range of the data (ii) Determine the median number of students failing the examinations of these courses. (iii) Determine the mean number of students failing the examinations of these courses.

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