The box plots show the number of hours of television a group of middle school students and a group of elementary school students watch each week.

The data for elementary school are more consistent than those for middle school.

About 50% of elementary school students watch between 4 and 7 hours of television each week.

On average, middle school students watch less television than elementary school students each week.

A, C, & E

Step-by-step explanation:

A. The data for elementary school are more consistent than those for middle school.

C. About 50% of elementary school students watch between 4 and 7 hours of television each week.

E. On average, middle school students watch less television than elementary school students each week.

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

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: