Question

Dave surveyed 80 7th-graders and 90 8th-graders. He found that about 75% of the 7th-graders like pop music, while 80% of the 8th-graders like pop music. Do more 7th-graders or more 8th-graders like pop music. Explain.

Answer 1

8th Grade: 90 x 0.80 = 72

7th Grade: 80 x 0.75 = 60

Conclusion: 8th Graders like pop music more because 72 out of the 90 in 8th grade Dave surveyed enjoy it, compared to the 60 out of 80 in 7th grade that enjoyed it.