Find the mean, median, and mode of the data set. round to the nearest tenth.
{2, 10, 6, 9, 1, 15, 11, 10, 15, 13, 15}
a. mean = 9.7, median = 10, mode = 15
b. mean = 8.9, median = 10, mode = 8
c. mean = 9.7, median = 8, mode = 15
d. mean = 8.9, median = 10, mode = 15