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Table - Weekly Electricity Usage (kWh) Apartment | Mon | Tue | Wed | Thu | Fri Flat 1 | 12 | 14 | 13 | 15 | 16 Flat 2 | 18 | 17 | 19 | 16 | 18 What is the overall average daily electricity usage for both flats?
- 16 kWh
- 15.8 kWh
- 17 kWh
- 14.5 kWh
Correct answer: 15.8 kWh
Solution
Sum of Flat 1 usage = 12+14+13+15+16 = 70. Sum of Flat 2 usage = 18+17+19+16+18 = 88. Total = 158, and the average over 10 days/entries is 158/10 = 15.8 kWh.
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