A survey made on 45 students for number of hours spent on watching TV in a week is recorded 8,4,7,10,12,15,10,9,8,7,12,14,16,5, 6,13,8,7,9,14,10,15,12,6,15,12,7,6, 9,10,6,15,14,10,4,9,8,10,7,4,8,7,13 ,6,18.
arrange the above data in ascending order:
(¡) how many students watch t. v for more then 15 hours a week
(¡¡) how many of them spend less then 6 hours a week on t. v

news channels,news papers,and the internet

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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rauschg

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answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

the answer is b