Organise the following marks in a class assessment, in a tabular form.
4, 6, 7,5, 3, 5, 4, 5, 2, 6, 2, 5, 1,9, 6, 5, 8, 4, 6, 7
(1)
(11
(1) Which number is the highest?
What is the range of the data?
(i) Which number is the lowest?
(iv) Find the arithmetic mean.
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