Casey finds that when asked for their email address, 15 of her customers will share their address with her. To simulate the behavior of the next 4 customers, she writes the numbers 1, 2, 3, 4, and 5 on cards and mixes them up. She then picks 4 cards, records the results, and puts the cards back. She repeats this experiment for a total of 20 trials. The results are shown in this list. Here, she let 1 represent someone sharing an email address and 2, 3, 4, and 5 represent someone not sharing an email address. 4121, 1223, 4233, 3344, 2434, 4241, 5415, 3421, 5214, 2234,4211, 1432, 5532, 4114, 4325, 4454, 4523, 4432, 3423, 1352 Using this simulation, what is the probability that, out of the next 4 customers, fewer than 2 will share their email address? Enter your answer, as a fraction in simplified form, in the box.