What is the average monthly temperature (°C) for a city over the course of a year if January's temperature is -5°C, February's is 2°C, March's is 8°C, and so on, up to December's at 15°C?
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What is the formula to find the variance of a data set?
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What are the characteristics (equation, foci, major and minor axis length) of the ellipse with the equation (x^2)/(a^2) + (y^2)/(b^2) = 1?