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A sample of 40 nuts Were picked at random from a factory and their diameters measured to the nearest 0.1 mm as below:
20.4 20.5 10.1 10.2 20.3 20.0 19.9 19.9
20.6 20.5 20.4 20.3 20.1 20.9 20.2 20.3
20.3 20.4 20.1 20.1 20.8 20.7 20.5 20.4
20.0 20.1 20.5 20.6 20.7 20.1 20.0 19.8
20.3 20.4 19.9 20.0 21.0 20.9 20.8 20.4
(a) Prepare a frequency distribution table for the information.
(b) Find the mode, mean and median of the data.