Suppose you have values on variable  equal to , and wish to compute a measure of variation from the mean. Without knowing what the exact values of the variable are, which of the following measures will necessarily generate a positive number (which is of course different from zero) regardless of the values for ?   a) the sum of absolute deviations from the mean b) the sum of deviations from the mean c) the sum of squared deviations from the mean d) the standard deviation e) a and c f) none of the above

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