Direction : Study the following table and answer the questions that follow : Electricity consumption (in MWh) in three quarters (Q1, Q2 and Q3) by five industrial zones (U, W, X, Y and Z)Industrial Zone Electricity Consumption (in MWh) Total Q1 Q2 Q3 U 120 150 180 450 W 180 210 240 630 X 160 180 220 560 Y 240 240 300 780 Z 200 220 260 680 Total 900 1000 1200 3100
What is the difference between the average electricity consumption per zone in Q3 and the average electricity consumption per zone in Q1 ?
60 MWh
The average per zone is the quarter’s total consumption divided by the number of zones, which is 5 (U, W, X, Y and Z).
Step 1 — Q3 total = 1200 MWh, so Q3 average = \(\frac{1200}{5} = 240\) MWh.
Step 2 — Q1 total = 900 MWh, so Q1 average = \(\frac{900}{5} = 180\) MWh.
Step 3 — Difference = \(240 - 180 = 60\) MWh. Equivalently, \(\frac{1200 - 900}{5} = 60\).
40 MWh, 50 MWh and 70 MWh do not match the computed difference; for instance, comparing the Q3 and Q2 averages (\(240 - 200 = 40\) MWh) answers a different question.
60 MWh option is correct.
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