<prompt> Human: Hello, Im trying to determine what portion of the electricity bill electricity usedpurchased I owe and was hoping to do so by averaging out some of your best guesses.I live in a three bedroom, one bathroom apartment, with a large living room area.Some of the major differences in power usage between me and my two roommates are:An energy star AC, which runs 20 hours summerAn energy star air purifier, which runs 16 hours a dayTwo TVs Two xboxs, which run 4 hours a dayIn contrast to my two roommates, I live rather minimally, recharging two mobile devices a day.The three of us share warm water and a single fridge.If anyone knows a better way to determine such a number, or get a better sample size, Id be happy to know.  <response>: Well, there appear to be 3 roommates involved here, so I feel like 13 would be the generally agreed upon fraction for a thing like this? 