Question

A survey was given to a class of
30
students about the number of movies they watch in a week. The results are shown in the table.



Number of Movies Number of Students
0

7

1

12

2

6

3
or more

5



The students that were surveyed are a representative sample of the school.



What is a valid inference that could be made about the students at the school?



A.
Less than
7
%
of the students watch
0
movies each week.

B.
More than
40
%
of the students watch
1
movie each week.

C.
More than
33
%
of the students watch
2
movies each week.

D.
Less than
20
%
of the students watch
3
or more movies each week.

Answer 1

Compute each category's sample percent (out of 30):

- 0 movies: 7/30 ≈ 23.3%
- 1 movie: 12/30 = 40%
- 2 movies: 6/30 = 20%
- 3+ movies: 5/30 ≈ 16.7%

Only choice D matches the sample (16.7% < 20%), so D is correct.