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??x = ?xvn = standard deviation of ?X and is called the standard error of the mean. Using the TI-83, 83+, 84, 84+ Calculator. To find probabilities for means Statistics in Action Calculator Notes for the TI-83 Plus and TI-84 Plus 45 List L6 now contains 50 sample means from a normal population with mean. Probabilities with the normalcdf Function. 2. For example, if IQ's are normally distributed with a mean of 100 and a standard deviation of 15, what.***Using the Calculator: To find mean & standard deviation of a frequency distribution or a probability distribution: First: STAT > EDIT ENTER,