Table:
test site
wastewater treatment plants
2018 population

central halifax
3
0.2

montreal island
1
2.0

toronto city
4
2.8

edmonton city
1
1.0

vancouver metro area
5
2.5

total
14
8.4

Could you calculate the row number and column number in this table? Present the final answer in a JSON format {"row_number": "m", "column_number": "n"} such as {"row_number": "2", "column_number": "3"}.

There are 7 rows and 3 columns in the table. So, the final answer is {"row_number": "7", "column_number": "3"}.