(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.
In Vedic astrology, Cat's Eye is the gemstone for the mythical planet 'Ketu' (also known as 'Dragon's Tail' as it is the headless lower body of the shadow planet Rahu). Cat's Eye is worn to nullify the malefic effects of Ketu in one's horoscope..