今天小学生report card拿回来了

[ccc]

我不知道啊。我就知道median，所以就拽一下。
Median就是排序后，位于正中间的的数。

你引用的帖子是：

median 是一半的学生得分比这个高，另一半比这个低

这个也不对。
60， 60， 60， 60， 60
的median是多少？

有病。一个班２４个学生，发生这种情况的可能性有吗？

你就拽吧！

 

[就是爱喝开水]

有病。一个班２４个学生，发生这种情况的可能性有吗？

学生考太差，老师放水了

 

[ccc]

学生考太差，老师放水了

笨笨去当老师，可能。哈

 

[就是爱喝开水]

那个学校。害人不浅。
median 用得很多。很多stats（收入，房屋卖价等）都用median。

但也不排除我家高中生自己的问题哈

煮熟的鸭子

 

[笨妈笨爸]

你引用的帖子是：




你就拽吧！

再拽一下：50, 60
Median是多少？

 

[还很远]

All E (excellent) in front page but many B in 2nd page.

"The first report card will be coming home soon. Each child is a unique learner and therefore learns and progresses at his/her own rate. When looking at the report card, you will see letter grades and comments for each subject. Although the A,B,C letter grades are used, they are not used like when we adults were in school. If a child receives a B mark, that means they are at the provincial level benchmark. This is where most students should be at this point in the year. I teach to the B level with my assignments and activities. If your child has achieved marks of C, it means that your child is approaching the provincial standard, but needs a little more practice and time to be reach the standard of achievement. Although A level is rare at this point, it indicates that a student is able to consistently demonstrate a deeper level of understanding of the subject without being reminded to."

 

[kanata]

这么说俺家老二还不错了 明天带她去ToysUS买个玩具奖励一下。

"The first report card will be coming home soon. Each child is a unique learner and therefore learns and progresses at his/her own rate. When looking at the report card, you will see letter grades and comments for each subject. Although the A,B,C letter grades are used, they are not used like when we adults were in school. If a child receives a B mark, that means they are at the provincial level benchmark. This is where most students should be at this point in the year. I teach to the B level with my assignments and activities. If your child has achieved marks of C, it means that your child is approaching the provincial standard, but needs a little more practice and time to be reach the standard of achievement. Although A level is rare at this point, it indicates that a student is able to consistently demonstrate a deeper level of understanding of the subject without being reminded to."

 

[cy25915]

B 不过是刚达标，也就是及格

 

[ccc]

再拽一下：50, 60
Median是多少？

先学习学习，然后再提问。

http://www.purplemath.com/modules/meanmode.htm

Mean, Median, Mode, and Range
Mean, median, and mode are three kinds of "averages". There are many "averages" in statistics, but these are, I think, the three most common, and are certainly the three you are most likely to encounter in your pre-statistics courses, if the topic comes up at all.

The "mean" is the "average" you're used to, where you add up all the numbers and then divide by the number of numbers.

The "median" is the "middle" value in the list of numbers. To find the median, your numbers have to be listed in numerical order, so you may have to rewrite your list first.

The "mode" is the value that occurs most often. If no number is repeated, then there is no mode for the list.

The "range" is just the difference between the largest and smallest values.

 

[马年吉祥]

再拽一下：50, 60
Median是多少？

55

 

[ccc]

55

55 is mean.

 

[马年吉祥]

55 is mean.

是的，但在偶数情况时，average of the middle two is medium.

 

[ccc]

B 不过是刚达标，也就是及格

 

[笨妈笨爸]

55

55 is mean.

55是对的，在这种特殊情况下就是mean，但是median不等于mean。
so simple concept. if we have 2n numbers sorted, then take the average of the n-th and (n+1)-th numbers.
If we have 2n+1 numbers sorted, then simply take the (n+1)-th number. That's it.

 

[笨妈笨爸]

B 不过是刚达标，也就是及格

B usually means 80-90 points