1. The problem asks whether the estimate for part 1 is an underestimate or an overestimate. 2. To determine this, we need to understand the context of the estimate: what quantity is being estimated and by what method. 3. Generally, an underestimate means the estimate is less than the actual value, and an overestimate means it is greater. 4. If the estimate was obtained by rounding down or ignoring positive contributions, it is likely an underestimate. 5. If the estimate was obtained by rounding up or including extra margin, it is likely an overestimate. 6. Without specific details about part 1, we cannot definitively say which it is. 7. Please provide the details or the method used in part 1 to analyze the estimate properly.