The table below shows the total number of registered votes and valid votes in two blocks (A and B) for the years 2012 and 2015. Year Registered Votes ...
Question
The table below shows the total number of registered votes and valid votes in two blocks (A and B) for the years 2012 and 2015.
| Year | Registered Votes in Block A | Registered Votes in Block B | Valid Votes in Block A | Valid Votes in Block B |
|---|---|---|---|---|
| 2012 | 750 | 1200 | 200 | 1000 |
| 2015 | 900 | 1300 | 720 | 1000 |
Note: Number of registered votes = Number of valid votes + Number of invalid votes.
Question:
Find the difference between the average number of invalid votes in both blocks in 2012 and the average number of invalid votes in both blocks in 2015.