Some of the measures used in descriptive statistics include the measures of central tendency and measures of variability.
A measure of central tendency is a single value that attempts to describe a dataset by specifying a central position within the data. The three most common measures of central tendency are the mean, median, and mode.
A measure of variability is used to describe the variability in a dataset. Measures of variability include variance and standard deviation.
Let's take a look at the measures of central tendency and an illustration in the following sections.
The mean or sample is the most popular measure of central tendency. It is equal to the sum of all values in the dataset divided by the number of values in the dataset. Thus, in a dataset of n values, the mean is calculated as follows:
We use 
if the data values are from a sample and μ if the data values are from a population.
The sample mean and...