A serving of a nutrition bar contains fat, carbohydrates and protein. The following table lists the number of grams of each and the number of calories per gram. Ingredient Number of grams Number of...

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Extracted text: A serving of a nutrition bar contains fat, carbohydrates and protein. The following table lists the number of grams of each and the number of calories per gram. Ingredient Number of grams Number of calories per gram Fat 12 9. Carbohydrates 23 4 Protein 6 4 Calculate the weighted mean that represents the average number of calories per gram for this nutrition bar with calories as the x variable and fat, carbohydrates, and protein as w.