题目内容
What is the average (arithmetic mean) of 330, 360, and 390？
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In how many of the years shown was the number of widgets sold at least three times the number of widgets sold in 1960？
According to the graph, which of the following is the best estimate of the total revenue from government funding in 1990？
In which of the following pairs of years were the ratios of Republican receipts to Democratic receipts most nearly equal？
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