Suppose that the starting salaries of female CFOs have a positively skewed distribution with mean of $56,000 and a standard deviation of $12,000. The starting salaries of male CEOs are positively skewed with a mean of $50,000 and a standard deviation of $10,000. A random sample of 50 female CFO’s and a random sample of 40 male CFO’s are selected. What is the probability that the sample mean salary of male CFO’s will not exceed that of the female CFO’s

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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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