The formula to determine the arithmetic mean or average of a set of n numbers is $ \bar{X}=\frac{\sum X}{n-1} $, where $ \bar{X} $ is the arithmetic mean of numbers in a set of data, and $ \sum X $ represents the sum of the numbers in the data set.

Question

Quizplus · Accepted Answer

The formula to determine the arithmetic mean or average of a set of n numbers is actually $ \bar{X}=\frac{\sum X}{n} $, not $ \bar{X}=\frac{\sum X}{n-1} $.

The Formula to Determine the Arithmetic Mean or Average of a Set