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Discrete Random Variables

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So there are some questions as part of a 20 question project quiz that I am stuck on

So I know that the chi squared is to do with the difference between the observerd and the expected values and that the lower the value is better so don't think the answer is D and I think the answer is A but not sure

So for this one I think the answer is D but I don't understand why that would be the answer

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