​Claim: The mean pulse rate​ (in beats per​ minute) of adult males is equal to 69.4 bpm. For a random sample of 138 adult​ males, the mean pulse rate is 67.9 bpm and the standard deviation is 10.7 bpm. Complete parts​ (a) and​ (b) below. a. Express the original claim in symbolic form. ▼ ▼ nothing bpm ​(Type an integer or a decimal. Do not​ round.) b. Identify the null and alternative hypotheses. H0​: ▼ equals

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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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