I have used it many times and without a problem until one day, a tyke asked me, "why is it 99th percentile and not just 99"? I don't know how to explain it to him. Then I thought, jeez, I don't know myself. can anyone explain?
I have found out so many definitions given online but I couldn't connect with any of them. they only had examples of its usage and no account of why it was so. so why is it called 99th percentile?