The marks (out of 20) obtained by a group of students in a mathematics test are : 13, 6, 10, 16, 13, 9, 12, 13, 14, 17, 18, 20, 9, 20, 18, 8.
Find (i) Range of the marks obtained
(ii) Median of the marks.
(iii) Mode of the marks.
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Range of the marks obtained
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