Coco S.A. supplies a range of computer hardware and software to 2000 schools within a large municipal region of Germany. When Coco S.A. won the contract the issue of customer service was considered to be central to the company being successful at the final bidding stage.

The company has now requested that its customer service director creates a series of graphical representations of the data to illustrate customer satisfaction with the service. The data in Table 1.38 has been collected over the last six months and measures the time to respond to the received complaint (days).

(a) Form a grouped frequency table.

(b) Plot the histogram.

(c) Do the results suggest that there is a great deal of variation in the time taken to respond to customer complaints?

(d) What conclusions can you draw from these results?

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5 87 56 34 43 78 26 15 28 23 Table 1.38 24 78 32 45 76 89 21 56 12 8 34 34 86 21 62 26 56 45 67 87 6 9 12 31 12 10 78 21 23 21 61 67 81 42 73 74 91 45 2478 56 4 32 12 3 78 85 26 43 54 38 54 52 53 67 23 15 21 25 76 32 23 53 21 12 32 12 34 65 79