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C. 1= d. sample variance = e. sample mean = 12. Using the Central Bank data found in learning module 5, for the account balances, find the (.75 each) a. Mean = c.. Standard deviation = b. Median = d. Is it positively or negatively skewed? 13. Suppose it is known that GMAT scores have a mean of 450 and a standard deviation of 25. What percent of students have scores between 450 and 475? (Z Score - 1.5 points)