#### 2.47

February 22, 2026

#### 2.47

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Total organic matter = \( 12 + 15.5 + 9.5 = 37 \, \text{g} \)
Total soil = \( 500 \times 3 = 1500 \, \text{g} \)
Percentage in composite = \( \frac{37}{1500} \times 100 = 2.466...\% \approx 2.47\% \)
An anthropologist studying food gathering practices in three remote communities records daily caloric intake per person: Community X averages 2,100 kcal, Community Y averages 3,400 kcal, and Community Z averages 2,800 kcal. If she surveys 12 people from X, 8 from Y, and 10 from Z, what is the weighted average daily caloric intake across all 30 individuals?
Total calories from X: \( 12 \times 2100 = 25,200 \)
Total from Y: \( 8 \times 3400 = 27,200 \)

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