Mr. Jenkins graded a 23-point history quiz. His class had a
mean score of 18 and a standard deviation of 2. He decided
the quiz should have been worth 100 points. To fix the
scores, he added 2 to every score and then multiplied by 4.
What are the new mean and standard deviation?

a)mean = 72; standard deviation = 8
b)mean = 80; standard deviation = 8
c)mean = 74; standard deviation = 10
d)mean = 80; standard deviation = 16

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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