(sigh) You truly don't get it, do you? A percentage is a *portion*; a likelihood. It has nothing to do with a common-ness... a frequency... which is a "per unit time" measurement.
My *chance* (likelihood) of being murdered (or, *anyone's* chance of being murdered) is a probability. OTOH, the *frequency* of murders in a community is a number of events per unit time. It is a separate and independent metric from "probability".
A city with 100 million population may have a murder rate (likelihood, probaility) that is effectively *zero* (0.0001%) yet have a murder EVERY NIGHT on the evening news! It is a COMMON occurrence. It happens FREQUENTLY!
A city with 1000 population may have a murder rate that is much, much higher! Maybe *1* percent (i.e., 10,000 times MORE LIKELY), yet murders happen
*monthly* rather than *daily*. It is far less COMMON. Yet, living in that city is much RISKIER than the first city! You are 10,000 times more likely to be one of those monthly victims than one of the DAILY victims in the first location!If you're thinking in terms of percentages, you're on entirely the wrong track! Percentages have no concept of time -- of FREQUENCY! ("per unit time")