Suppose that the number of calls per hour to an answering service follows a Poisson process with rate 10 per hour. Suppose that each call, independently, is made by a man with probability 2/3, and by a woman with probability 1/3, and the gender of the caller is independent of the time of the call. a) (2 points) What is the probability that in one hour exactly 4 men and exactly 2 women will call the answering service

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answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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