Notice how if we were to sort our numbers in order we get 0.7955 0.7965 0.7975 0.7985 and 0.7995. Each 0.0010 away from each other with 0.7975 as the middle. Note then how 0.7955 + 0.7995 = 2(0.7975) and 0.7965 + 0.7985 is also equal to 2(0.7975) with this we get a simple 5 * 0.7975 which greatly simplifies things in this problem. This gets us the final 3.9875. Sure, this calculation is not easy to make, but it can still be simplified with 50.8 - 50.0025 this gets us 4 - 0.0125 = 3.9875. This I feel is generally easier to do in this case, please correct me if I got something wrong here. 😄
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