1. **Stating the problem:** Jessica wants to find the average height of 10th grade students at West High School using the heights of 44 students. 2. **Part (a): Units of measurement for height** - Heights are measurements of length, so appropriate units are units of length. - Pounds and grams are units of weight/mass, so they are not suitable. - Ounces are also units of weight, so not suitable. - Centimeters and inches are units of length, so they are suitable. 3. **Answer for (a):** The suitable units are **centimeters** and **inches**. 4. **Part (b): Best procedure to find average height** - To find an accurate average, measurements should be reliable and representative. - Randomly picking 44 students and measuring their heights ensures accuracy and randomness. - Having students state their own heights may introduce errors. - Asking for volunteers may introduce bias because volunteers may not represent the whole population. 5. **Answer for (b):** The best procedure is **Randomly pick 44 students from the 10th grade and measure their heights**. 6. **Summary:** - (a) Units: centimeters, inches - (b) Procedure: Randomly pick 44 students and measure their heights This approach ensures accurate and unbiased estimation of the average height.