points one student got 1 分,2分,3分,4分number of students 4 人 7人 8人 6人（上下对应,即拿了1分的学生有4个）1what is the median points?2 if the teacher chooses one of her students at random,what is the probability that that student will have earned higher than the median grade on the quiz?(我搞不懂这里的higher than median到底包不包括median自身)
问题描述：
points one student got 1 分,2分,3分,4分
number of students 4 人 7人 8人 6人（上下对应,即拿了1分的学生有4个）
1what is the median points?
2 if the teacher chooses one of her students at random,what is the probability that that student will have earned higher than the median grade on the quiz?
(我搞不懂这里的higher than median到底包不包括median自身)
答
1,1,1,1,2,2,2,2,2,2,2,3, 3, 3,3,3,3,3,3,4,4,4,4,4,4
中间数是 3
median = 3
higher than median 不包括 median 本身
总人数是25
六个人大於 median
6/25
例题 2,2,3,4,5,6 的median 是 (3 + 4)/2 = 3.5