5.1 TWO RANDOM VARIABLES 5.2 PAIRS OF DISCRETE RANDOM VARIABLES 5.2.1 Marginal Probability Mass Function 5.3 THE JOINT CDF OF X AND Y 5.4 THE JOINT PDF OF TWO CONTINUOUS RANDOM VARIABLES 5.4 INDEPENDENCE OF TWO RANDOM VARIABLES 5.5 JOINT MOMENTS AND EXPECTED VALUES OF A FUNCTION OF TWO RANDOM VARIABLES 7.1 SUMS OF RANDOM VARIABLES 7.1.1 Mean and Variance of Sums of Random Variables 7.2 THE SAMPLE MEAN AND THE LAWS OF LARGE NUMBERS 7.3 THE CENTRAL LIMIT THEOREM 9.1 DEFINITION OF A RANDOM PROCESS 9.2 SPECIFYING A RANDOM PROCESS 9.2.2 The Mean, Autocorrelation, and Autocovariance Functions 9.6 STATIONARY RANDOM PROCESSES 9.6.1 Wide-Sense Stationary Random Processes 9.6.2 Wide-Sense Stationary Gaussian Random Processes