Final answer:
To calculate the residual for 2020 with a per capita carbon emission of 7.41 tons per capita, subtract the actual per capita carbon emission from the target value.
Step-by-step explanation:
To calculate the residual for 2020 with a per capita carbon emission of 7.41 tons per capita, we need to know the expected value or target value for carbon emission in 2020. If we have that value, we can subtract the actual per capita carbon emission from the target value to find the residual.
For example, if the target value for carbon emission in 2020 is 6 tons per capita, we can calculate the residual as follows:
Residual = Target value - Actual value = 6 - 7.41 = -1.41 tons per capita.