What if no value repeats?

Then the set has no mode. If several values tie for most frequent, every one of them is a mode.

Average Calculator

Mean, median, mode, range and standard deviation of any list.

Your result appears here

Fill in the fields on the left and press Calculate. The answer, the breakdown and a copy button all land in this card.

Mean = sum ÷ count; Median = middle value when sorted; Mode = most frequent value

Sample standard deviation divides by n − 1 and is the right choice when your numbers are a sample of a larger group.

For 12, 7, 3, 21, 7, 15, 9: the sum is 74, the mean is 10.57, the median is 9, the mode is 7 and the sample standard deviation is about 6.00.

When a few extreme values would distort the picture. Incomes and house prices are usually reported as medians for exactly that reason.