6. USH Financial is examining the use of its midtown ATM machine. The numbers of transactions made per day at this ATM during the past 20 days are as follows: 54, 59, 62, 64, 65, 68, 71, 71, 71, 73, 76, 77, 79, 79, 82, 83, 85, 87, 94, 96. Frequency 4 4 4: 50 60 70 80 90 100 Number of transactions Figure 1 (a) Which measures of central tendency do not exist for this data set? Choose all that apply. 1. Mean 2. Median 3. Mode 4. None of these measures