Published the first work of important statistics.
Developed the use of simple averages.
Helped Fermat solve the dice problem (how many times one must throw a pair of dice before one expects a double six).
Wrote and published papers on probability. He also developed the Bernoulli trials (success or failure).
Wrote the Analytical Theory of Probabilities. This consisted of two books; generating functions and approximations and defining probability.
Wrote papers on statistical methods such as the least squares method.
Wrote a paper on the laws of birth vs. mortalities.
Pioneer of statistical correlations and regression.
Known as the father of Statistics. He developed the Chi-Square test.
Developed the t-test (to handle small sample quantities for quality control).
Contributed majorly to experimental design and analysis.