Math Problem Statement

The geometric mean is often used in business and economics for finding average rates of​ change, average rates of​ growth, or average ratios. Given n values​ (all of which are​ positive), the geometric mean is the nth root of their product. The average growth factor for money compounded at annual interest rates of 8.5​%, 4.1​%, and 2.6​% can be found by computing the geometric mean of 1.085​, 1.041​, and 1.026. Find that average growth​ factor, or geometric mean. What single percentage growth rateLOADING... would be the same as having three successive growth rates of 8.5​%, 4.1​%, and 2.6​%? Is that result the same as the mean of 8.5​%, 4.1​%, and 2.6​%? Question content area bottom Part 1 The average growth​ factor, or geometric​ mean, is what? Round to 4 decimals.

Solution

The geometric mean of the given growth factors 1.085,1.041,1.0261.085, 1.041, 1.026 is calculated as:

Geometric Mean=1.085×1.041×1.0263\text{Geometric Mean} = \sqrt[3]{1.085 \times 1.041 \times 1.026}

Let's compute this value. Given growth factors growth_factors = [1.085, 1.041, 1.026]

Compute geometric mean

geometric_mean = (growth_factors[0] * growth_factors[1] * growth_factors[2]) ** (1/3)

Round to four decimal places

geometric_mean_rounded = round(geometric_mean, 4) geometric_mean_roundedThe average growth factor, or geometric mean, is 1.0504 (rounded to four decimal places).

Part 2: Equivalent Single Percentage Growth Rate

The equivalent single percentage growth rate is found by converting the geometric mean back to a percentage:

Growth Rate=(Geometric Mean1)×100\text{Growth Rate} = (\text{Geometric Mean} - 1) \times 100

Let's compute this value. Compute the equivalent single percentage growth rate equivalent_growth_rate = (geometric_mean_rounded - 1) * 100 equivalent_growth_rateThe equivalent single percentage growth rate is 5.04%.

Part 3: Comparing with the Arithmetic Mean

Now, let's compare this result with the arithmetic mean of the given percentages:

Arithmetic Mean=8.5+4.1+2.63\text{Arithmetic Mean} = \frac{8.5 + 4.1 + 2.6}{3}

Let's compute this value. Given growth percentages growth_percentages = [8.5, 4.1, 2.6]

Compute arithmetic mean

arithmetic_mean = sum(growth_percentages) / len(growth_percentages) arithmetic_meanThe arithmetic mean of the given percentages is 5.07% (rounded to two decimal places).

Conclusion

The geometric mean growth rate (5.04%) is slightly lower than the arithmetic mean (5.07%), which is expected because the geometric mean accounts for compounding effects and provides a more accurate measure for growth rates over time.


Would you like a more detailed explanation of any step?

Here are some related questions:

  1. How is the geometric mean different from the arithmetic mean in financial analysis?
  2. When should the geometric mean be used instead of the arithmetic mean?
  3. Can the geometric mean ever be greater than the arithmetic mean?
  4. How does the geometric mean help in calculating average investment returns?
  5. What happens if one of the values in the geometric mean calculation is zero?

Tip: The geometric mean is particularly useful in cases involving percentages, ratios, or rates of change, as it preserves the proportionality between values.

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Math Problem Analysis

Mathematical Concepts

Geometric Mean
Average Growth Factor
Percentage Growth Rate

Formulas

Geometric Mean = (Product of Values)^(1/n)
Equivalent Growth Rate = (Geometric Mean - 1) * 100
Arithmetic Mean = (Sum of Percentages) / n

Theorems

Geometric Mean Theorem
Properties of Growth Rates

Suitable Grade Level

Grades 10-12