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A sample of 5 persons with hypertension underwent a special blood-pressure-reducing treatment program which resulted in the following values giving reduction in systolic blood pressure for these persons (i.e. the scores give SBP after treatment - SBP before treatment): -5, 10, 20, 5, 10. Suppose for a second sample of 5 persons, the sample mean is 10, and the sample variance is 25. Then which of the following statements about this second sample is not correct?