Organise the following masks in a class assessment, in a tabular form.
4, 6, 7,5, 3,5, 4, 5, 2, 6, 2,5, 1, 4, 6, 5, 8, 4, 6, 7
(i) Which number is the highest ?
(ii) Which number is the lowest ?
(iii) What is the range of the data?
(iv) Find the arithmetic mean.
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