Given the following data what measure of central tendency would be the most effective measure of central tendency? Hold times for 20 customers for Dell technical support: 5.80 2.00 6.30 4.00 5.20 5.50 5.20 13.00 4.20 10.60 3.70 7.00 3.00 8.00 8.80 12.50 3.40 6.50 14.00 35.00 standard deviation median mean mode