Here are the numbers of calls received during 21 randomly chosen hours at a customer support service. 1, 3, 6, 7, 8, 9, 11, 11, 11, 12, 13, 13, 14, 14, 14, 17, 17, 18, 19, 22, 23 Send data to calculator Send data to Excel Frequency 10 8 6 4 4 4 2 2 2 0. 0 5 10 15 20 20 Number of calls Answer the questions below. (a) For these data, which measures of central tendency take more than one value? Cheese all that apply Mean Median Mode 25