Question

Guest

how to get that?

(20 )A clsss of pupie takes a speling tesL Thelr mean score for the test is mr Anoiher PuPH TekeS
the test and scores n. When this pupil's result is included with the other results it is found tht

the mean has decreased by 2.
Which equation below gives the correct expression for r in terms of 7

7
A      2二

B      ーー

如一3
2
世一3
7ー2

ァニーーー

3
芝填2

カルニーーー

直一1

如
ォ=ニー

 

で  し

 
 
 
 
 
 
 
 
 

加十2
、れ=ーテ=ー

Answer 1

K

Let me know if there’s anything you are unclear.

Answer 2

クロバ🍀

Are you foreign people?

Guest

yes, because on my country setting don’t have many people use it

クロバ🍀

Oh,that’s too bad.
How grade are you?

Guest

I just need help to explain how to get the answer please

クロバ🍀

Oh,sorry.
I want to answer your question but,I have no ability to answer it.

Guest

Ok