Question

a national survey of middle - school students asks which subject is most challenging. which of these samples is a representative sample? 372 sixth - graders in a certain town 972 seventh - graders in a certain county 619 eighth - graders in different states 400 students from various states, representing different grades 6 - 8

Explanation:

A representative sample should reflect the whole population. Here, the population is national middle - school students (grades 6 - 8). The last option has students from various states and different grades 6 - 8.

Answer:

400 students from various states, representing different grades 6 - 8