Question

这是一道英文式数学题，请大家快来帮帮忙吧！ 急！ 谢谢了！

The following table shows the weekly pocket money (in dollars) received by 30 students.

Weekly pocket money ($) 50 60 70 80 90 100
Number of students 2 4 9 8 6 1

If the weekly pocket money of 4 students are each increased from $70 to $90, the new mean weekly pocket money received by the students is $_______ ,
correct to the nearest $0.1.

Answer 1

将英语译成中文(简体)
下表显示了30名学生获得了每周的零用钱（美元）。

每周的零用钱（元）50 6070 80 90 100
学生2 4 98 6 1

如果4名学生每周的零花钱是每个从70美元上升至90美元，学生收到新的平均每周的零花钱是$_______，
正确的最接近的每股面值0.1。

这很简单嘛.只要难在翻译啦

Answer 2

(50*2+60*4+70*9+80*8+90*6+100*1+(90-70)*4) /30=77.7

Answer 3

语文数学我经常打满分,历史地理也是谢谢各位了!鞠躬. 我的英语也这是一个老生常谈的话题，大家知道，单词是英语的基础，没有单词，就好象建