Cho surveyed a random sample of 60 students in the school's library about whether they read the newest magazine. Fifteen of the
60 students said they read the newest magazine. Cho determined that 360 students visit the library each day. Based on the survey, how many of the 360 students can he expect to read the newest magazine?
Given that Cho surveyed a random sample of 60 students in the school's library, of which 15 said they read the newest magazine, and that a total of 360 students attend the library every day, to determine how many of the 360 students can have expect to read the newest magazine the following calculation should be performed:
60 = 100
15 = X
15 x 100/60 = X
1,500 / 60 = X
25 = X
Thus, 25 percent of the students in the sample read the newest magazine. Since 25% of 360 is 90 (360 x 0.25), that is the number of students he can expect to have read the magazine.
