. Suppose your teacher gave a quiz and the scores of 28 students in your Psychological Statistics class is as follows. (Compute the range, quartiles, interquartile, semi-interquartile, mean, sum of scores, variance and standard deviation)
12, 5, 12, 11, 6, 11, 11, 10, 10, 8, 9, 7,8, 6, 8, 8, 9, 7, 7, 11, 12, 7, 9, 6, 6, 10, 5, 10, 5, 4,