The numbers of incorrect answers on a true-false competency test for a random sample of 5 students were recorded as follows: 1, 2, 6, 5 and 6. What are the sample mean, median and variance? A The sample mean is 4, sample median is 2 and the sample variance is 1. B The sample mean is 2, sample median is 5 and the sample variance is 5.5. C The sample mean is 4, sample median is 6 and the sample variance is 5.5. D The sample mean is 4, sample median is 5 and the sample variance is 5.5.

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