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Over the past year there have been 12 cancers of a certain type in the southern part of your…

Over the past year there have been 12 cancers of a certain type in the southern part of your…

Over the past year there have been 12 cancers of a certain type in the southern part of your city. The expected number of such cancers in a population of that size is 8.4. Could this difference be due just to chance or does it appear there may be some environmental cause of cancer present in your city?