Consider the population of new graduates in 2020. There are N = 240,000 graduates, and students are categorized based on their school rank X and the salary they earn at graduation Y. The frequencies of each possible combination of X and Y are in the image attached. 1. Find the marginal probability distribution of x and the marginal probability distribution of y 2. calculate "mu_y" (greek letter mu, subset y) 3. calculate "sigma_y" (greek letter sigma, subset y)

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