(Redirected from Weighted mean) In colloquial language, an average is the sum of a list of numbers divided by the number of numbers in the list. In mathematics and statistics, this would be called the arithmetic mean. In statistics, mean, median, and mode are all known as measures of central tendency.
Definition of cat'sâeye for English Language Learners. : 1  a jewel that has a pale stripe running down its middle which makes it look like the eye of a cat. : 2  a marble with round circles that look like eyes.
The retina is the reflective part of the eye. That's why cat's eye reflect so well, their retina are more exp â¦ osed in the night because their pupils (or whatever they are in a cat) open wider than ours exposing more of that mirror at the back, the retina.he nervous system. Your eyes are part of your brain. The majority of. your brain surface is light-sensitive.