How do you work this out?

£365

Step-by-step explanation:

so add another column and call it midpoint. use the weekly earnings column to find the midpoints add both numbers then divide by 2

then times all these numbers by the corresponding frequencies

1     * 200=200      

11    * 300=3300

5    * 400=2000

0    *  500=0

3    * 600=1800

then add these numbers =7300  then do 7300/20=365

17

Step-by-step explanation: