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3) Imagine an urn containing 25% black spheres and 75% white spheres. Suppose you are to...

3) Imagine an urn containing 25% black spheres and 75% white spheres. Suppose you are to draw from this urn with replacement; you’ll draw 60 times and note the color of each sphere. Let X be the number of black spheres drawn. What is the distribution of X? What is the expected number of black spheres drawn? What is the probability that you see at least a third of this expected number?

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