13. Suppose X ~ N(12, 3). Between what x values does 68.27% of the data lie? The range of x values is centered at the mean of the distribution (i.e., 12). a. between x = −12 and x = 12 b. between x = −3 and x = 3     c. between x = 3 and x = 21 d. between x = 6 and x = 18 e. between x = 9 and x = 15

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