A part of a promotion, students who participate in a survey are mailed a free pass for one of three activities: movies, roller skating, or bowling. Participants have an equal chance of receiving each type of pass. If 900 students participate, how many would be expected to receive a pass for roller skating?
Since participants have an equal chance of receiving each type of pass, the probability of receiving a roller skating pass is 1/3.
Therefore, the expected number of students who would receive a roller skating pass can be calculated as:
Expected number = Total number of participants * Probability of receiving a roller skating pass
Expected number = 900 * 1/3
Expected number = 300
Therefore, 300 students would be expected to receive a pass for roller skating.