(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.
Your catâs eyes, usually clear and bright, are looking a little gooey. She might be pawing at them, or rubbing her face against the sofa or on the rug. Clearly, somethingâs wrong. Anything from a simple cold to a serious illness could be be causing your catâs eye discharge.