想做数学题的进来看下吧，急问~~！

sukigmat

A corporation with 5000000 shares of publicly listed stock reported total earnings of $7.20 per share for the first 9 months of opertation. During the final quarter the number of publicly listed shares was increased to 10000000 shares, and fourth quarter earnings were reported as $1.25 per share. What are the average annual earnings per share based on the number of shares at the end of the year?
答案是$4.85.

求助会做此题的高手们，是怎么算出来哒？

selinamba

(7.2*5,000,000+10,000,000*1.25)/10,000,000=4.85

sukigmat

Tks~~！！

Kelvin8809

9、    一个表格，是养宠物的人数和宠物数量
    宠物数量         0        1          a          >=4
养宠物的人数量    4       5          2            b
问：宠物数量的median是多少？
（1）a=2
（2）b=4
1)不充分
2)充分，可以知道median是1，选B
【v2】还有一个DS求median
Pet people
0    4
4     5
5     b
A     X
X     X
(请童鞋们把上面的想象成一个表格。= = 。标X的地方数字是给出来的，不过我不记得了，sorry。)
1）b=2？
2）A=某个数
有条件1就可以求了
数据有点差异，不过应该原理都是一样的哈~如果有记忆更准确的筒子也过来确认下咯