There are 50 people in total, which is an even number, indicating that the median should be the average number of trees planted by the 25th and 26th people after sorting.

Through observation, 9+ 16=25, indicating that the 25th person planted 2 trees, while the 26th person ranked on that 14, that is, 4 trees were planted.

So the median is (2+4)/2=3.

Look at the second question:

I think you did this problem wrong from the beginning.

It should represent Xiao Wu, not Xiaohua.

I think you should think that the longer you spend online, the fewer people there will be. . Then I can only say that most of these 40 people are good students (let's just say that those who don't surf the Internet are good students), not ordinary students. According to common sense, there are not many students who rarely surf the Internet, and there are not many students who often surf the Internet, and the online time is generalized.

For example, normally speaking, a class's academic performance should not be more than 90 points, nor less than 60 points, but most of them are concentrated in 70 or 80, which is normal. Otherwise, it is either a key class or a poor class. I hope you know what I mean.

After determining Xiao Wu, let's look at this problem: because there are 40 people, it is still an even number, and the median is the average of the 20th and 2 1.

But here we only need to determine which interval, 6+ 10= 16, 6+ 10+ 16=32, that is to say, the 20th person, that is, 2 1 person, has an average of 2-3 hours.

Do as you want. There are 22 people in the first paragraph, and the median is in the first paragraph, 0- 1 hour.