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Given that the graph shows a use of electricity in a city's daily rate (in millions of kilowatts) rightarrow We have to calculate the total daily usage of electricity by summing the area of rectangles rightarrow we have to use left end points and right end points to get the average use of electricity width of each rectangles is2 hours Using Left end points \r\n = 2(3.7 + 3.9 + 4.5 + 5.2 + 6.4 + 7.8 + 9.6 + 11.7 + 12.8 + 11.8 + 8.4 + 5.6) = 182.8 By using right end points 2(3.8 + 4.3 + 5.3 + 6.1 + 7.8 + 9.6 + 11.6 + 13.5 + 11.7 + 8.7 + 5.7 + 4.7) = 185.6 Therefore Average of left end point and right end point is = (182.8 + 185.6/2) = 184.2 million kw/hrs = almostequalto 184 million kw.hours
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