Final answer:
To determine the total variation in water level, multiply the rate of change by the time period. Another way to check the answer is by summing all individual variations in water level over the given time period.
Explanation:
The total variation in water level can be determined by multiplying the rate of change (1.8 mm/year) by the time period (2.2 years). In this case, the total variation would be 1.8 mm/year x 2.2 years = 3.96 mm.
To check the answer, you can additionally calculate the total variation by adding all the individual variations in water level over the 2.2 years together.
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