# Summary

**Mean:**It is given by adding all the values of the observations and dividing it by the total number of observations. It is denoted as . Therefore, . For an ungrouped frequency distribution

Â

**Median:**It is the value of the middle most observation. If n is odd, the median = value of the()

^{th Â }observation. If n is even, Median = Mean of the values of the ()

^{th}and ( +1)

^{th}observations .Â

**Mode:**The mode is the most frequently occurring observation