18. Using the following set of data below, calculate all measures of central tendency. (1 point each) Data: 3 7 3 21 16 4 21 19 12 14 21 16 a. Sample mean = b. Median = c. Mode= 19. Using the data from #18, identify the skew of the distribution (no skew, positive, negative, or cannot determined). (1 point) 20. Using the data from #18, which measure of central tendency would best represent the distribution. (1 point)