Question

Lucy collects data from a random sample of seventh-graders. Out of 40 respondents, 7 attend afterschool programs. Of the 200 seventh-graders attending Lucy’s school, how many would be expected to attend afterschool programs?

Answer 1

Out of 40 respondents, 7 attend afterschool programs. $\frac{7}{40}=0.175$, so 17.5% of students attend afterschool programs.
$0.175*200=35$.
So, out of 200 seventh-graders, 35 would be expected to attend afterschool programs.