Enter your Sign-on user name and password.

Forgot password?
  • Follow us on:
Loading video...

Start Learning Now

Our free lessons will get you started (Flash® 10 required).
Get immediate access to our entire library.

Sign up for Educator.com

Features Overview

  • Get on-demand access to our complete library
  • Search and jump to exactly what you need to learn
  • Track your progress
  • Download practice and lesson files
  • *Ask questions and get answers from our community & instructors

Combining Independent Random Variables

  • If two random variables are independent, their joint probability is the product of the two marginal probabilities.

  • The mean of the sum of independent random variables is the sum of the means of the independent random variables.

  • The variance of the sum of independent random variables is the sum of the variances of the independent random variables.

Combining Independent Random Variables

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

Mathematics: AP Statistics