which of the following statements is true? a. the sum of the squared deviations from the arithmetic mean is always zero b. the sum of the deviations from the arithmetic mean is always zero c. the standard deviation is always less than the variance d. the distance between the first and third quartiles is twice the distance between the first quartile and the median e. the arithmetic mean is always less than the geometric mean if two data sets have the same range: a. the distances from the smallest to largest observations in both sets will be the same b. the smallest and the largest observations are the same in both sets c. both sets will have the same mean d. both sets will have the same interquartile range