A scientist wants to find the average mass of fish living in a large pond. So she will use the masses of a sample of fish from the pond to find the average mass. Answer the questions below. $$ \begin{array}{l} ext { (a) Which unit(s) could be used for the unit of measurement? Check all that apply. } \ \square ext { minutes } \quad \square ext { kilograms } \quad \square ext { grams } \quad \square ext { milligrams } \square ext { seconds } \ ext { (b) Which of the procedures below would be the best way to find the average mass? } \ ext { Randomly pick } 30 ext { fish from the entire pond and weigh each of them. } \ ext { Rick } 30 ext { fish from a shallow region of the pond and estimate their masses. } \ ext { Pick } 7 ext { fish from a shallow region of the pond and weigh each of them. }\end{array} $$

Question

A scientist wants to find the average mass of fish living in a large pond. So she will use the masses of a sample of fish from the pond to find the average mass. Answer the questions below. $$ \begin{array}{l}	ext { (a) Which unit(s) could be used for the unit of measurement? Check all that apply. } \ \square 	ext { minutes } \quad \square 	ext { kilograms } \quad \square 	ext { grams } \quad \square 	ext { milligrams } \square 	ext { seconds } \ 	ext { (b) Which of the procedures below would be the best way to find the average mass? } \ 	ext { Randomly pick } 30 	ext { fish from the entire pond and weigh each of them. } \ 	ext { Rick } 30 	ext { fish from a shallow region of the pond and estimate their masses. } \ 	ext { Pick } 7 	ext { fish from a shallow region of the pond and weigh each of them. }\end{array} $$

UpStudy AI · Accepted Answer

Let's analyze the problem step by step.

### Part (a): Units of Measurement
We need to determine which units are appropriate for measuring the mass of fish. The options given are:

- minutes
- kilograms
- grams
- milligrams
- seconds

**Analysis:**
- **Minutes**: This is a unit of time, not mass. **(Not applicable)**
- **Kilograms**: This is a unit of mass. **(Applicable)**
- **Grams**: This is also a unit of mass. **(Applicable)**
- **Milligrams**: This is a smaller unit of mass. **(Applicable)**
- **Seconds**: This is another unit of time, not mass. **(Not applicable)**

**Conclusion for Part (a)**: The applicable units for measuring mass are:
- kilograms
- grams
- milligrams

### Part (b): Best Procedure to Find Average Mass
Now, we need to evaluate the procedures for finding the average mass of fish:

1. **Randomly pick 30 fish from the entire pond and weigh each of them.**
2. **Pick 30 fish from a shallow region of the pond and estimate their masses.**
3. **Pick 7 fish from a shallow region of the pond and weigh each of them.**

**Analysis:**
- **Option 1**: Randomly picking 30 fish from the entire pond is the best method because it ensures a representative sample of the entire population of fish in the pond. Weighing each fish provides accurate data for calculating the average mass.
  
- **Option 2**: Picking 30 fish from a shallow region and estimating their masses is not ideal. Estimating can lead to inaccuracies, and focusing only on a shallow region may not represent the entire pond's fish population.

- **Option 3**: Picking only 7 fish from a shallow region is also not ideal. A smaller sample size (7 fish) may not provide a reliable average mass, and again, it may not represent the entire pond.

**Conclusion for Part (b)**: The best procedure is:
- Randomly pick 30 fish from the entire pond and weigh each of them.

### Final Answers:
- **(a)** Applicable units: kilograms, grams, milligrams.
- **(b)** Best procedure: Randomly pick 30 fish from the entire pond and weigh each of them.
- **(a)** Applicable units: kilograms, grams, milligrams. - **(b)** Best procedure: Randomly pick 30 fish from the entire pond and weigh each of them.

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