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Using the Desmos Graphing Calculator, the regression line for the data points is:
y = 0.62x + 4.91
To predict the strength of coffee a 45-year-old would prefer, we substitute x = 45 into the regression line equation:
y = 0.62(45) + 4.91
y = 27.9 + 4.91
y ≈ 32.81
Therefore, the regression line predicts that a 45-year-old would prefer a cup of coffee that is approximately 32.81 grams in strength.