Of the 800 seventh grade students and 640 eighth grade students at Knox Middle School, 90 students will be chosen at random to attend an assembly.

Which of the following would be a representative sample of the number of seventh and eighth grade students at the school?

Question

Clay Villa

Mathematics

27 April, 05:51

Of the 800 seventh grade students and 640 eighth grade students at Knox Middle School, 90 students will be chosen at random to attend an assembly.

Which of the following would be a representative sample of the number of seventh and eighth grade students at the school?

+4

Answers (1)

Know the Answer?

Julia Sandoval · Answer 1

50 7th grade and 40 8th grade

Step-by-step explanation:

1. add to get total number of students, 1440

2. find percentage of total that are 7th grade students and 8th grade student:

640/1440 = ~45% (are 7th grade)

800/1440 = ~55% (are 8th grade)

3. 55% of 90 is 50, and 45% of 90 is 40

Of the 800 seventh grade students and 640 eighth grade students at Knox Middle School, 90 students will be chosen at random to attend an assembly. Which of the following would be a representative sample of the number of seventh and eighth grade students at the school?

Of the 800 seventh grade students and 640 eighth grade students at Knox Middle School, 90 students will be chosen at random to attend an assembly.

Which of the following would be a representative sample of the number of seventh and eighth grade students at the school?