7. The following is a sample of scores on a college algebra test that had a maximum of 175 points. 138, 145, 139, 141, 139, 137, 136, 143, 142, 140 a) Find the mean of the data set (2 points) b) Find the standard deviation of the data. Round to the 2nd decimal place. (2 points) c) Sixty-eight percent (68%) of the data will be between which two (2) values? (4 points) d) Find the standardized z-score rounded to the 2nd decimal place for 138. Interpret your answer. (4 points)