Find the mean, median, and mode of the following list of values. Round to the nearest tenth if necessary. 18, 7, 40, 23, 29, 30, 7, 7 a. Mean = 20.1 Median = 20.5 Mode = 7 c. Mean = 20.1 Median = 23 Mode = 7 b. Mean = 20.1 Median = 20.5 Mode = 40 d. Mean = 80.5 Median = 20.5 Mode = 7