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Shereen Elebeidy

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Help needed with statistics
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If we combined data in a set why the mean will decrease? It was a problem on khan academy but I cannot post a picture of it unfortunately
Need help with a math Question
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A tank initially contains 7 gallons of water. A faucet is opened and water begins pouring into the tank at a rate of 1.5 gallons per minute untill the tank is full. Which of the following represent...