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A homeowner wants to find out how much electricity his central air conditioner used for the summer of 2008 . His (non-AC) summer average for 2007 was $\$ 105$.

2008 bills: June: \$126, July: \$132, August: $\$ 141$

What is the 2008 summer average, how much more does his central AC cost him?
in Data Science & Statistics by Diamond (80,744 points) | 15 views

1 Answer

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$\dfrac{\$ 126+\$ 132+\$ 141}{3}=\$ 133$

His average summer electric bill for 2008 is \$ 133. \$ 133 - \$ 105=\$ 28
It cost \$28 per month more to run his central $\mathrm{AC}$, or \$ 84 for the summer of 2008 .
by Diamond (80,744 points)

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