What is the mode of 10, 12, 11, 10, 15, 20, 19, 21, 11, 9, 10?A21B11C10D9Answer: C. 10 Read Explanation: The mode of the data set 10, 12, 11, 10, 15, 20, 19, 21, 11, 9, 10 is 10 Mode is the most repeating numberRead more in App