In a survey based on a random sample of high school seniors at Roosevelt High School, 60% of those surveyed said they do more than 2.5 hours of homework per day. Based on this
data which of the following conclusions are valid? (Choose 2)

A) Less than 60% of all seniors at Roosevelt do more than 2.5 hours of homework per day.

B) About 60% of seniors at Roosevelt do more than 2.5 hours of homework per day.

C) About 40% of all seniors at Roosevelt do less than 2.5 hours of homework per day.

D) 40% of seniors at Whitney do no homework.