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The expected value of a Martingale system is the last observed value.
For a population the mean and the expected value are just two names for the same thing. For a sample the mean is the same as the average and no expected value exists.
The expected value is 7.
Expected value is the outcome of confidence of how probability distribution is characterized. If the expected value is greater than the confidence interval then the results are significant.
0. The expected value of the sample mean is the population mean, so the expected value of the difference is 0.