The below table shows the number of the music systems that were sold by two companies in the years 2014 to 2017. What is the difference between the average sale of company A and company B?
|
Year |
Company A |
Company B |
|
2014 |
5640 |
6980 |
|
2015 |
8412 |
10512 |
|
2016 |
7148 |
8620 |
|
2017 |
8424 |
10020 |
1
7406
2
1627
3
2016
4
9033