You want to survey seventh-grade students about computer use. Which sample is more likely to be random?

You ask seventh-graders entering a library on Friday night.

You ask seventh-graders leaving a school basketball game.

You ask seventh-graders entering the computer lab.

You ask seventh-graders leaving the cafeteria after lunch.

Entering the computer lab I believe.

Step-by-step explanation:

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.