Phần hướng dẫn bên dưới chưa có bằng tiếng Việt nên được hiển thị bằng tiếng Anh. Bản thân máy tính đã được dịch đầy đủ.
Cách sử dụng máy tính này
- Enter your numbers separated by commas, spaces or new lines.
- The average updates as you type.
Công thức
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.
Câu hỏi thường gặp
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.