3.1: Random Variables and Probability Distributions
                                                                                
                                                                                    
                                                                                        3.1.1: Discrete Random Variables
                                                                                    
                                                                                    
                                                                                        3.1.2: Expected Values of Discrete Random Variables
                                                                                    
                                                                                    
                                                                                        3.1.3:  Standard Deviation and Variance of Discrete Random Variables
                                                                                    
                                                                                    
                                                                                        3.1.4: Variance of Two Independent Discrete Random Variables
                                                                                    
                                                                                    
                                                                                        3.1.5: Continuous Random Variables