Henry wants to find the average time it takes West High School students to run a lap around the track. So he will consider 40 students to find the average time. Answer the questions below. $$ \begin{array}{l} ext { (a) Which unit(s) could be used for the unit of measurement? Check all that apply. } \ \square ext { pounds } \ ext { (b) Which of the procedures below would be the best way to find the average time? } \ ext { Measure the times of } 40 ext { volunteers who run a lap around the track. } \ ext { Ask for } 40 ext { volunteers to run a lap around the track and have them state their own times. } \ ext { Randomly pick } 40 ext { students to run a lap around the track and have them state their own times. } \ ext { Randomly pick } 40 ext { students to run a lap around the track and measure their times. }\end{array} $$

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Henry wants to find the average time it takes West High School students to run a lap around the track. So he will consider 40 students to find the average time. Answer the questions below. $$ \begin{array}{l}	ext { (a) Which unit(s) could be used for the unit of measurement? Check all that apply. } \ \square 	ext { pounds } \ 	ext { (b) Which of the procedures below would be the best way to find the average time? } \ 	ext { Measure the times of } 40 	ext { volunteers who run a lap around the track. } \ 	ext { Ask for } 40 	ext { volunteers to run a lap around the track and have them state their own times. } \ 	ext { Randomly pick } 40 	ext { students to run a lap around the track and have them state their own times. } \ 	ext { Randomly pick } 40 	ext { students to run a lap around the track and measure their times. }\end{array} $$

UpStudy AI · Accepted Answer

Let's break down the problem step by step.

### Part (a): Units of Measurement
To find the average time it takes for students to run a lap around the track, we need to consider appropriate units of time. The options provided include "pounds," which is a unit of weight and not relevant for measuring time.

**Possible units of measurement for time include:**
- Seconds
- Minutes

Thus, the correct answer for part (a) is:
- **Seconds**
- **Minutes**

### Part (b): Best Procedure to Find Average Time
Now, let's evaluate the procedures listed for finding the average time:

1. **Measure the times of 40 volunteers who run a lap around the track.**
   - This method relies on volunteers, which may introduce bias if the volunteers are not representative of the entire student population.

2. **Ask for 40 volunteers to run a lap around the track and have them state their own times.**
   - This method is also biased because it relies on self-reported times, which may not be accurate.

3. **Randomly pick 40 students to run a lap around the track and have them state their own times.**
   - While this method uses random selection, it still relies on self-reported times, which can lead to inaccuracies.

4. **Randomly pick 40 students to run a lap around the track and measure their times.**
   - This is the best method because it combines random selection (to ensure a representative sample) with actual measurement of times (to ensure accuracy).

**Conclusion for part (b):**
The best procedure to find the average time is:
- **Randomly pick 40 students to run a lap around the track and measure their times.**

### Summary of Answers
- **(a)** Units of measurement: Seconds, Minutes
- **(b)** Best procedure: Randomly pick 40 students to run a lap around the track and measure their times.
- **(a)** Units of measurement: Seconds, Minutes - **(b)** Best procedure: Randomly pick 40 students to run a lap around the track and measure their times.

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