Calculate the variance and the standard deviation of the following classified data. 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, with their respective frequencies of 2, 6, 8, 1, 17, 17, 24, 18, 13, 10, 4,