Summary  
This chapter covers calculating the arithmetic mean of a numerical dataset by summing its values and dividing by the total count.

General domain of usage  
Statistical analysis

The study of statistical measures starts with the concept of the **mean value**. To calculate the **mean**, add all the numbers in a dataset and divide the sum by the total number of values.

The illustration below shows how to calculate the **mean** salary of a group of people:


Build a strong foundation in statistics using Python. Learn essential statistical concepts and apply them through NumPy and pandas. Move from basic measures like mean and variance to hypothesis testing, confidence intervals, and data-driven insights with hands-on practice.

Discover core statistical principles, including data types, measures of central tendency, and key differences between samples and populations.

Learn to calculate and interpret mean, median, and mode using Python. Practice these operations with pandas to analyze real datasets.

Understand how variance and standard deviation measure data spread. Learn to compute both manually and using Python tools.

Explore how covariance and correlation describe relationships between variables. Practice calculating and comparing both metrics in Python.

Master confidence intervals to estimate population parameters. Use NumPy, pandas, and visualization libraries to calculate and interpret intervals with real data.

Learn the fundamentals of hypothesis testing and the t-test. Understand how to design, perform, and interpret tests using Python to support data-driven decisions.

Mean Value