The mean (arithmetic mean) is the sum of several numbers divided by their count — the most common statistic for representing a typical value in a dataset.
Enter comma-separated numbers to instantly calculate the arithmetic mean. Useful for summarizing multiple values such as test scores or sales data.
For example, the mean of 10, 20, 30, 40, 50 is 30.
The arithmetic mean — the everyday "average" — is the sum of a set of values divided by how many there are. It summarises a whole dataset in one number, but it is sensitive to extreme values.
Enter comma-separated numbers to get the mean, along with the count and sum of the values.
The arithmetic mean adds every value and divides by the count, which makes it sensitive to outliers: salaries of 30, 32, 35, 38 and 300 have a mean of 87 but a median of 35. Which average to report depends on the shape of the data — the mean suits symmetric data, the median suits skewed data.
Mean = (x₁ + x₂ + … + xₙ) / nThe mean is the arithmetic average, the median is the middle value when sorted, and the mode is the most frequent value. In a set like 1, 2, 2, 100 the mean is 26.25, the median is 2 and the mode is 2.
Use the median when the data has outliers or a skewed distribution — house prices and incomes are the classic cases. One billionaire drags the mean far above the typical person's income, but the median stays realistic.
Multiply each value by its weight, add the results and divide by the total weight. Two 30 % assignments scored 80 and 70 plus a 40 % final scored 90 give 0.3 × 80 + 0.3 × 70 + 0.4 × 90 = 81.
No, the arithmetic mean always sits between the smallest and largest values. If a calculator gives something outside that range, a value was mistyped or one entry has the wrong sign.
2026-10-19