2. [17] A random sample of examination grades from a large mathematics class is given below: 925457707863 8178527065 . For this sample, find: a) [2] The mean b) [2] The median c) [2] The variance d) [1] The standard deviation e) [2] The interquartile range (IQR) f) [2] The upper whisker g) [2] The lower whisker h) [3] Draw a box plot to represent the data