Clarence comes up trumps in recycling


A pictograph using bottles is employed to represent the information in this article. The scale across the bottom starts at zero which helps to display fairly the relative performances of the councils. The average percentage (65%) at the bottom of the pictograph is obtained by adding the 10 percentages above and dividing by 10. Is this an accurate way of representing the percentage of households participating in recycling in the 10 councils?

There is another possibility, which would involve knowing the actual number of pariticpating households and total households in each council. The precise percentage for the 10 councils would be the total participating households in the 10 regions divided by the total number of households in the 10 regions. There is no reason why this should be 65% as smaller councils may do better than larger ones (in which case the overall percentage could be lower than 65%).


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