Chaqpter 6 Slides 22 and 35. From the normal distribution or the empirical rules, we know 95.45% of the population is between = 2 standard deviations away from the mean. Given the standardized normal distribution, z has the mean of O and the standard deviation of 1. A test follows a normal distribution with a mean of 80 and a standard deviation of 10. A sample of 4 test scores is randomly selected, the sample mean a is 79 and the sample standard deviation s is 10.5. Which one of the following states about the empirical rules is incorrect? O More than 95% of all of the possible sample means are between 80 12 x 10 / V/4. O More than 95% of all possible test scores are between 60 and 100. O More than 95% of all of the possible sample means care between 79 # 2 x 10.5 / V/4. None of them is correct. O 95.45% of all possible z values are between -2