Outa wants to compare the mean of his test scores in French class to the mean absolute deviation. Language Test Scores

French Scores

76

62

94

80

He uses the steps below to find both the mean and mean absolute deviation.

French Scores

Step 1
Add the scores.
76 + 62 + 94 + 80 = 312

Step 2
Divide the sum of the scores by 4.
312 divided by 4 = 78

Step 3
Add the differences between the mean and each score.
(76 minus 78) + (62 minus 78) + (94 minus 78) + (80 minus 78) = 0
Step 4Divide by 4.
StartFraction 0 over 4 EndFraction = 0

In which step did Souta make the first error?
Step 1
Step 2
Step 3
Step 4

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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step-by-step explanation:

b and c

step-by-step explanation: