I imagine if my occupation includes carrying a gun, interacting with citizens, and a historically high rate of extrajudicial deaths amongst people I am supposed to be protecting. A publicly accessible camera would be beneficial to easing the minds of those I interact with and providing evidence for any actual instances where I felt my life was threatened.
It’s percentage of the entire population, if you organized everyone from lowest to highest IQ, what percentage of the entire population would you need to include for them to be in the top. It’s a little clearer when a point of interest is near the top. E.G. “person is in the top 1% of people in terms of wealth.”
A less kind way to say it is ‘91% of people have a higher IQ than this person’.