George and his friends have planned a potluck for the weekend. george has informed his friends that each of them should bring any one of four types of food items: a pie, sandwiches, a salad, or a dessert. george wants to find the probability that lydia and bert will bring a pie for the potluck. george designs a simulation where he tosses a fair coin four times. if the coin lands on tails at least once, lydia and bert will bring a pie for the potluck. george repeats this for 80 trials. what revision should george make to his simulation?