situational irony
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Contrast is a synonym for difference. Expected means when something can be easily predicted or you could assume this would happen. Reality is when is something that could happen but doesn't really include predicting anything. It is more of using common sense to analyze something that could happen.
research it!!
I believe it is irony
0. The expected value of the sample mean is the population mean, so the expected value of the difference is 0.
no