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This link takes you to the list of capsules in the subcategory Vector Operations under Multivariable Calculus within Classroom Capsules and Notes.

This link takes you to the list of capsules in the subcategory Lines and Planes under Multivariable Calculus within Classroom Capsules and Notes.

This link takes you to the list of capsules in the subcategory Conic Sections & Quadric Surfaces under Multivariable Calculus within Classroom Capsules and Notes.

This link takes you to the list of capsules in the subcategory Polar, Cylindrical and Spherical Coordinates under Multivariable Calculus within Classroom Capsules and Notes.

This is a brief article that starts with the uniform distribution on a finite set to motivate the general axioms of a probability measure.

This applet demonstrates an "$$\dots$$experiment consist[ing] of rolling $$n$$ dice, each governed by the same probability distribution."

This page contains the definition of the covariance and correlation of random variables. It contains properties, with proofs, of both concepts, such as the variance of a sum.
Wikipedia entry for covariance. It contains definitions for covariance of random variables and random vectors; a discussion of properties; and the calculation of sample covariance.
Wikipedia entry for correlation.
A video explaining the concept of iterated expectations. The formula is developed, and consequences of that formula to the field of econometrics are discussed.