Monthly normal rainfall data 1x, y2 for Portland, Oregon,
Chapter 4, Problem 4.3.56(choose chapter or problem)
Monthly normal rainfall data 1x, y2 for Portland, Oregon, are 14, 2.472, 17, 0.582, 18, 1.072, where x represents time in months (with x = 1 representing January) and y represents rainfall in inches. Find the values of a, b, and c rounded to 2 decimal places such that the equation y = ax2 + bx + c models this data. According to your model, how much rain should Portland expect during September? (Source: National Climatic Data Center)
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