以下のガイドはまだ日本語に翻訳されていないため、英語で表示しています。計算機自体はすべて日本語に対応しています。
この計算機の使い方
- Enter your numbers separated by commas, spaces or new lines.
- The average updates as you type.
計算式
The arithmetic mean is the sum divided by the count. The geometric mean suits growth rates and ratios; the harmonic mean suits rates such as average speed over equal distances. Both require positive numbers.
Mean = (x₁ + x₂ + … + xₙ) / n
Geometric = (x₁ × x₂ × … × xₙ)^(1/n)
Harmonic = n / (1/x₁ + 1/x₂ + … + 1/xₙ)
Example
- 10, 20, 30, 40, 55: sum = 155, n = 5.
- Average = 155 / 5 = 31; median = 30.
よくある質問
What's the difference between mean and median?
The mean adds everything and divides by the count; the median is the middle value. The median is less affected by outliers, so it's often used for incomes and house prices.
How do I calculate a weighted average?
Multiply each value by its weight, add the results, and divide by the sum of the weights. The weighted grade calculator does this for grades.
Can I average percentages?
Only if they share the same base. Otherwise compute a weighted average using the underlying counts.