A school is required by the government to give some randomly chosen students a standardized test. From previous experience, the school knows about 68% of their students will receive passing scores in math and English. To improve funding, the school needs to score at least 70% on the standardized test. This year the school can decide if it wants to test 100 or 200 students. Should the school test 100 or 200 students? Explain the answer.