Use the following information to answer each question below. Estimate any irrational answers to one deci place. The chemistry test scores of 9 students were recorded as follows: 100, 84, 91, 77, 69, 92, 93, 93, 88. 18. Find the mean and range of the chemistry test scores. (84) 19. Find the median and mode of the chemistry test scores. (183) 20. Find the standard deviation of the chemistry test scores. (84)