A scientist wants to find the average weight of fish living in a large pond. So she will use the weights of 42 fish from the pond to find the average weight. Answer the questions below. \( \begin{array}{l}\text { (a) Which unit(s) could be used for the unit of measurement? Check all that apply. } \\ \square \text { pounds } \square \text { meters } \square \text { inches } \square \text { ounces } \square \text { feet } \\ \text { (b) Which of the procedures below would be the best way to find the average weight? } \\ \text { Pick } 42 \text { fish from a shallow region of the pond and weigh each of them. } \\ \text { Pick } 42 \text { fish from a shallow region of the pond and estimate their weights. } \\ \text { Randomly pick } 42 \text { fish from the entire pond and estimate their weights. } \\ \text { Randomly pick } 42 \text { fish from the entire pond and weigh each of them. }\end{array} \)

Let's break down the problem step by step. ### Part (a): Units of Measurement We need to identify which units could be used for measuring the weight of fish. The options provided are: - pounds - meters - inches - ounces - feet **Analysis of Units:** - **Pounds**: This is a common unit for measuring weight. ✔️ - **Meters**: This is a unit of length, not weight. ❌ - **Inches**: This is also a unit of length, not weight. ❌ - **Ounces**: This is another common unit for measuring weight. ✔️ - **Feet**: This is a unit of length, not weight. ❌ **Conclusion for Part (a)**: The applicable units for measuring weight are: - Pounds - Ounces ### Part (b): Best Procedure to Find Average Weight Now, we need to determine the best procedure for finding the average weight of the fish. The options provided are: 1. Pick 42 fish from a shallow region of the pond and weigh each of them. 2. Pick 42 fish from a shallow region of the pond and estimate their weights. 3. Randomly pick 42 fish from the entire pond and estimate their weights. 4. Randomly pick 42 fish from the entire pond and weigh each of them. **Analysis of Procedures:** 1. **Pick 42 fish from a shallow region and weigh each**: This may not represent the entire pond's fish population, as fish in shallow regions may differ in weight from those in deeper areas. ❌ 2. **Pick 42 fish from a shallow region and estimate their weights**: This is not ideal as estimating weights can lead to inaccuracies. ❌ 3. **Randomly pick 42 fish from the entire pond and estimate their weights**: While random selection is good, estimating weights can lead to inaccuracies. ❌ 4. **Randomly pick 42 fish from the entire pond and weigh each of them**: This is the best option as it ensures a representative sample of the entire pond and provides accurate weight measurements. ✔️ **Conclusion for Part (b)**: The best procedure is: - Randomly pick 42 fish from the entire pond and weigh each of them. ### Final Answers: - **Part (a)**: Pounds, Ounces - **Part (b)**: Randomly pick 42 fish from the entire pond and weigh each of them.