This document discusses common measures used to describe data sets. It covers measures of location such as the mean, mode, and median, as well as measures of variation like range, mean deviation, variance, and standard deviation.
2. Measures of location
1- Arithmetic mean
a- The Sample Mean
b- The Population Mean
2- The Mode
3- The Median
Measures of Variation
1- Range
2- Mean Deviation
3- Variance
4-Standard Deviation