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- Simple Average =
- Weighted Average =
- Arithmetic Mean = (a
_{1}+ a_{2}+ a_{3}….a_{n}) / n - Geometric Mean =
- Harmonic Mean =

For two numbers a and b

⇒ AM = (a + b)/2

**EduRev's Tip:**

- AM ≥ GM ≥ HM is always true. They will be equal if all elements are equal to each other. If I have just two values then GM
^{2}= AM x HM - The sum of deviation (D) of each element with respect to the average is 0
⇒ D = (x

_{1}- x_{avg}) + (x_{2}- x_{avg}) + (x_{3}- x_{avg}) ... + (x_{1}- x_{avg}) = 0 𝑥

_{avg}= (x_{assumed av}g + (Deviation/No. of elements))

**Median** of a finite list of numbers can be found by arranging all the observations from lowest value to highest value and picking the middle one.**Mode** is the value that occurs most often

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