mathworld.wolfram.com
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MathWorld is Wolfram’s comprehensive online mathematics encyclopedia with rigorously written, cross-referenced articles on a wide range of topics. Its Descriptive Statistics entry explains core measures (mean, median, mode, variance, standard deviation), dispersion, and summary techniques, with formulas and worked examples.
More resources on Descriptive Statistics
stattrek.com
StatTrek is an online statistics resource offering tutorials, explanations, and calculators for descriptive statistics (mean, median, mode, standard deviation, range) and other topics like probability, distributions, and hypothesis testing.
Statistics with R
Coursera course: Statistics and Data Analysis with R
Introduction to Statistics
Stanford's "Introduction to Statistics" teaches you statistical thinking concepts that are essential for learning from data and communicating insights. By the end of the course, you will be able to perform exploratory data analysis, understand key principles of sampling, and select appropriate tests of significance for multiple contexts. You will gain the foundational skills that prepare you to pursue more advanced topics in statistical thinking and machine learning. Topics include Descriptive Statistics, Sampling and Randomized Controlled Experiments, Probability, Sampling Distributions and the Central Limit Theorem, Regression, Common Tests of Significance, Resampling, Multiple Comparisons.
khanacademy.org
Khan Academy offers free, structured lessons on descriptive statistics with videos and practice problems covering measures of center and spread (mean, median, mode, range, standard deviation) and basic data visualization.
Introductory Statistics
Introductory Statistics - A book resource
The Art of Statistics
The Art of Statistics - A book resource