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 randomly survey 50 girls in the entire school. she can randomly survey 50 seventh - graders in the school.

Explanation:

To get a representative sample of seventh - graders' homework hours, the sample should be from seventh - graders. Surveying friends may introduce bias, surveying sixth - graders or girls from the whole school is not relevant to seventh - graders. Randomly surveying 50 seventh - graders gives a sample from the target group.

Answer:

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