3. The number of customers at a dry-cleaning shop were recorded over a period of 30 working days. The results were as follows: 20 28 26 25 | 19 | 27 18 | 32 26 30 31 29 31 25 21 25 21 24 29 18 27 19 23 31 28 31 25 34 27 31 (a) Construct a cumulative relative frequency table and use this to draw a cumulative relative frequency curve. (b) Find the five-number summary for these data. (c) Display your answer to b. as a box and whisker plot

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