Four Continuous Distribution PDFs

This example demonstrates the graphical representation and properties of four different types of continuous probability density functions (PDFs). Key math concepts include probability & statistics on PDFs, calculus involving integral calculations, and function graphing. The construction uses GeoGebra's Integral command to compute the definite integrals of f_1 to f_4 over the interval [a, b], involving objects like f_1 to f_4, a, b, c, e, a_1, a_2, a_3, a_4. Suitable for high school and above students learning probability & statistics and calculus to understand the characteristics of continuous distribution functions and their integral applications.