Question

A movie critic rates movies on a scale of 4 stars (excellent) to 1 star (worthless). A summary of her ratings for 20 movies is shown in the table.

The table titled movie ratings show 3 movies with 4 stars, 7 movies with 3 stars, 6 movies with 2 stars, 4 movies with 1 star.

If the critic rates a total of 100 movies, what is the best prediction for the number of movies she gives exactly 3 stars?

A.
35

B.
27

C.
47

D.
50

Answer 1

Use the observed proportion: 7 of the 20 movies were 3-star, so the estimated proportion is 7/20 = 0.35. For 100 movies, predict 0.35×100 = 35.

Answer: A (35).