Answer with Explanation:
<em>I can see that you haven't attached the results.</em>
Under Ideal Gas Law, "pressure" is<u> directly proportional to the number of molecules</u> (provided that the volume and temperature remains constant).
Most of the atmosphere's molecules are drawn towards the surface of the Earth because of "gravity." This means that there are <u>more atmospheric molecules closer to the Earth's surface,</u> which also means the air pressure in lower altitude is higher due to a denser air space.
This, in turn, leaves a <u>lesser number of atmospheric molecules as the height increases</u> which means there is lesser atmospheric pressure in areas of higher altitudes due to a less denser air space.
So, this explains the answer.