Based on a random sample of customers at a departmental store, the table below shows the number of customers arrived in the first, second, third and fourth quarter of the year. 1st Quarter 2nd Quarter Jan - Mar Apr - Jun 200 290 3rd Quarter Jul - Sep 270 4th Quarter Oct Dec - 240 (a) Name an appropriate graphical summary for this data set. (b) Test the null hypothesis of equal proportions using a = 0.01. (c) Is the sample size large enough for the inference in part (b) to be valid?

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