John is a coffee enthusiast who wants to perfect his homemade espresso recipe. He believes that the ratio of coffee grounds to water is crucial in achieving the best flavor and aroma. To experiment with this, John tries out four different levels of coffee grounds and four different water volumes in his espresso shots. Each batch of espresso, made with a specific combination of coffee grounds and water, is tasted by a group of three coffee aficionados who rate the espresso on a scale from 1 to 10 , with 1 indicating extremely poor taste and 10 indicating exceptional taste. Now, based on the feedback from the tasting panel, John aims to determine the ideal ratio of coffee grounds to water for his espresso recipe.

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