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The classes in a primary school had the following number of pupils:
42 45 48 40 46 42 44 48 39 40 42
41 47 46 45 49 45 42 40 38 39
46 47 42 40 41 43 44 45 46 48
(a) Make a frequency distribution table.
(b) Determine the mode.
(c) Calculate the mean.