Answer Happy

2 - 1: (True or False) a) A combination is a group of k elements selected from a set of N distinct elements where the order of selected elements makes no difference. # the event A can occur b) Probability of an event A = Total # of occurenrce c) Pr (X<5) = 1 - Pr (X>5) d) A discrete random variable is one which can take on only a countable number of distinct values like 0, 1, 2, 3, 4, 5...100, 1 million, etc. e) PDF must integrate to 1. f) The Gaussian distribution is also called “normal” distribution. g) Expectation is the sum of all the values of the random variable ar weighted by their probabilities. h) 2nd moment of distribution is also called the variance. i) The square root of the variance is called the standard deviation. j) The marginal PMFs are obtained by summing over the same variable.