Question

cheryl wants to find the number of hours seventh - graders do homework each week. there are 297 girls and boys in seventh grade. which is the best way for cheryl to get a representative sample without spending too much time? she can survey 15 of her friends in the school. she can survey every sixth - grade student in the school. she can survey every sixth - grade student in the school. she can randomly survey 50 girls in the entire school. she can randomly survey 50 seventh - graders in the school. she can randomly survey 50 seventh - graders in the school.

Explanation:

A representative sample should be from the target population (seventh - graders in this case) and be randomly selected. Surveying friends is biased, surveying sixth - graders or only girls is not representative of seventh - graders as a whole. Randomly surveying 50 seventh - graders from the school gives a more representative sample of the 297 seventh - graders.

Answer:

She can randomly survey 50 seventh - graders in the school.