Permutations and Combinations

Permutations When the order does matter it is called Permutation. In other words, a Permutation is an ordered Combination. We should really call this a "Permutation Lock"! There are basically two types of permutation: Repetition is Allowed: such as the lock above. It could be "00000". No Repetition:...

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Mean vs Variance vs Standard Deviation

Mean: The mean is the average of the numbers. Variance: Variance is nothing but the average of the squares of the deviations. Standard Deviation: Standard Deviation is the square root of the numerical value obtained while calculating variance. Definition of Variance In statistics, variance is...

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