Why would an administrator lower an RF signal on a wireless access point?
Increase QoS
Lower interference
Lower the signal to keep it in the building
Make it harder for guests to access the network

1. Increase QoS

Explanation:

The radio bands with lower frequency have relatively large wavelengths that are not as affected by objects such as building, trees, weather events or other features in the troposphere as the higher frequency radiation. General rule for radiation is that the lower the frequency, i.e. the longer the wavelength, the further a signal can penetrate through solid objects or liquids. Hence, when the frequency is lowered on a wireless access point, the signals can travel farther and smoother. Thus, increasing the quality of service.

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that would be my answer.