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mode, lol, to calculate ur average gas bill add up all pevious prices (over the last 8 years) and divide by the amount of prices u have added up (8). That gives u ur average bill. To find the total cost u just add them up, no median of mean (wtf r u on about)

Be carefull though your gas prices are probably increasing ; you are not just more likely to use more gas but also gas prices are rising.

Mate, it's not hard, I'm 14 :(

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Wiki User

13y ago

What else can I help you with?