Data from a small bookstore are shown in the accompanying table. What is the value of R² and what does it mean?

Number of sales people working Sales (in $1000)

3 10

4 12

5 13

9 14

11 18

11 20

13 20

15 22

16 22

20 26

x=10.7y= 17.7

SD (x) =5.56 SD (y)=5.21